Weight & Payload Planner

Use this tool to organize information and identify questions. It cannot tell you that a build is safe to drive around a corner. The red map marker is a center of known, positioned component weights, not a measurement of your complete vehicle's center of gravity.

What is available?

A visitor draft is temporary. Closing the tab, reloading or leaving may lose it; the tool does not promise automatic browser recovery. A printed PDF preserves a report, not an editable saved plan. Sign in or check account availability if you want account storage.

Without signing in: make a standalone plan

1. Open the planner. Start with a blank plan and give it a useful name, such as “Trailer — travel loading.” Saving to an account and project imports remain unavailable.
2. Enter actual interior dimensions. Choose pounds/inches or kilograms/millimetres. Replace the starting 336 × 96 × 96 inches with measured usable space. Choose flat, V-shaped or rounded front geometry as appropriate.
3. Set the baseline and rating. Enter the measured baseline weight and document the tank levels, equipment and supplies included in that weighing. Enter manufacturer GVWR from the applicable label or documentation. A personal planning limit is optional.
4. Add a manual item. Enter its name, per-item weight, quantity, footprint length/width and height where known. Add materials, appliances, batteries, water contents, supplies or other loads you actually intend to carry. A manual planner item does not add a component to the shared registry or to a project.
5. Account for baseline items. If an item was already present in the baseline weighing, select “Already included in measured baseline.” This avoids adding its full weight again. Check the explanation below before using this with fluids.
6. Place items. Select a layer and mounting location, then choose “Place on layout” or enter coordinates. Drag a placed item to adjust it. Use the item list and layer filter to select overlapping items.
7. Explore placement and known component weight. Try water fill levels or alternate layouts. Baseline, GVWR, axle/scale records and saved loading scenarios become available with an account; linked plans use the Builder’s project record.
8. Keep a report. Click “Print plan,” review the new window and choose “Print / Save as PDF.” You can also sign in in the separate tab, return and click “Check sign-in” to save the current draft.

Undo/Redo helps with recent edits in the current session. It is not a backup after the tab closes. Starting a new blank plan discards the current draft after confirmation.

With an account: use project data and saved plans

1. Select Your project beside Saved plans. Choose Standalone plan, your project, or a project labeled “shared.” Selection loads the shared project measurements. Component import remains a separate action.
2. Prepare the project's measurements. The Builder can open Layout & Baseline in the project navigation. Record interior dimensions, front shape, mounting allowances, baseline/GVWR and optional axle/scale information. Existing Build Specs platform length/width are separate from usable interior measurements.
3. Use “Refresh project information” after Builder updates. Linked plans automatically load the record when opened or saved. Placements that no longer fit are unplaced for review. Recorded scale readings are not automatically confirmed for the current plan loading.
4. Bring in project components. Use the button in the Project components card. Current project weight and dimension overrides take priority over catalog values. Correct imported specifications in the project, then refresh/reopen the plan.
5. Add extra manual items and arrange the load. Imported values remain read-only, but placement, rotation, layer, mounting location, inclusion and baseline treatment can be adjusted. Add water contents separately when comparing tank fill levels.
6. Save plan. Give the plan a meaningful name. “Save plan” updates the current saved plan; “Save as new” makes a separate copy. Captured loading scenarios are retained with the saved plan.
7. Open the saved plan in 3D. Save current 2D changes first, then use the 3D button. The separate view edits the same saved plan. Save in 3D, return to 2D and reopen to view those changes.
8. Revisit and document. Select the plan and Open. Linked project weights and dimensions refresh from current authorized records when opening or saving. Recheck scale context after source or placement changes, then print a current report.

Working as a co-builder or assistant

Current accepted teammates can import shared components and layout measurements into their own private plans. The existing active-account and team verification rules apply. A pending invitation does not grant access. Only the Builder edits shared measurements on Layout & Baseline. Teammates can vary arrangements and loading in their private plans; standalone plans support independent vehicle measurements.

A teammate cannot open another account's private saved plan. If team access ends, linked project data and plans are no longer available through that membership. A PDF can be shared separately by its author, but this tool does not publish a saved plan for teammates.

Switching projects and working in multiple tabs

Changing the project removes previously imported items after confirmation; manual items remain. Standalone plan removes the project association. If you save from an older tab after another tab updated the plan, reopen the latest plan instead of overwriting it. Keep a report of any draft details you need before reopening.

Layout, baseline and payload

Length, width and height describe usable interior space. Height starts at 96 inches and is required. It supports vertical-clearance and 3D checks; payload totals come from weights, quantities and the baseline. The default height is not an actual measurement or a recommendation for your vehicle.

Front shape: Flat has no extension depth. Choosing V-shaped or Rounded enables depth. Length includes that extension. The rounded outline uses a half-ellipse approximation, and rectangular footprints must fit its usable shape. A cab or hood outside the usable body is not an interior extension.

Baseline weight is a fixed measured starting condition. Document the weighing date, installed equipment, people/supplies if present, and fuel/water levels. If those conditions change, establish a consistent new baseline or properly account for the changes. The planner does not automatically subtract removed equipment, consumed fluids or passengers from that number.

Manufacturer GVWR governs the overall entered manufacturer limit. A lower personal limit remains an additional target. A higher personal value does not override manufacturer GVWR. Combined axle ratings do not create or raise the manufacturer's GVWR.

Example: With a measured baseline of 4,500 lb and manufacturer GVWR of 14,000 lb, the arithmetic remaining amount is 9,500 lb before additional loads. Adding 2,000 lb gives a known total of 6,500 lb and remaining amount of 7,500 lb, assuming no unknown added weights. That arithmetic does not demonstrate acceptable axle, tire, hitch, braking or handling conditions.

The manufacturer label has distinct GVWR and axle-rating information. See 49 CFR 567.4 certification-label provisions; confirm the current rules applicable to your equipment and location.

Items, specifications and water

Display and weight are separate

Select an item from the list in 2D. Under Display and weight, use Show in layout to hide its drawing. Distributed materials also have Show material coverage, so insulation can remain counted without shading the whole map. Hidden items retain their positions and remain selectable from the list.

Include in weight totals is a separate choice. Excluded items can still be drawn and appear gray. Hiding an item or switching layers does not change its included weight, balance calculations, or recorded scale-reading validity. Hidden objects still receive fit and overlap checks. The optional Weight density view continues to show included loads in the selected layer, even when their individual drawings are hidden.

Save the plan to retain display choices in both views. Captured loading scenarios retain their own choices. When changing how an installation is grouped, a group stays visible if any of its previous instances was visible; an entirely hidden group stays hidden. Existing plans start with their drawings enabled.

Material display defaults

In Add/Edit Project Component, find Material display defaults. Automatic starts new distributed-material imports with coverage hidden, while individual items and groups remain visible. Show object / material coverage starts all display options enabled. Concealed material hides the drawing but keeps selected-item photos available. Choose Custom to set drawing, coverage and photo defaults separately. Defaults use the documented placement choice; names such as insulation or PEX are not guessed.

Defaults never change weight inclusion, geometry, shape, elevation, layers or installation status. New project imports use the latest defaults. Existing saved plans, captured scenarios, and earlier items without explicit display flags retain their prior choices. Reopen or refresh the plan to fetch changed project defaults, then select an item and click Use display defaults in the 2D planner to apply them to that item in the current loading. Save the plan to keep the change. Other items and captured scenarios are not reset.

Manual items use the same button to apply automatic defaults for their placement. Hiding coverage does not remove its weight or position; a hidden material can still affect the Weight density overlay. Photos remain in the selected-item details panel and never fill the map. Pipe/wire routes remain a later stage.

Component photos with Cloudinary

Open Edit Project Component → Component photos. Use Add component photo with Cloudinary to upload through the existing project photo form; this component is selected for you. Save pending edits before uploading. Reload the component form after the upload, choose a primary photo (or leave Automatic), and save. Existing active photos linked to this installation are available too. To attach an existing project photo, use its existing Edit Media form and select this component.

Select the imported component in the 2D planner to see its photos in the details panel. The primary photo comes first; click a thumbnail to open a larger image. Use Show component photos under Display and weight to hide the photos for this item, then save the plan. Layout visibility, photo visibility, and weight inclusion are independent. Insulation pictures stay in the panel and never fill the map. Photos are reference/documentation images, not 3D geometry or textures. Unknown shapes continue to use the current planner representation.

Images use the existing project permissions and protected Cloudinary delivery. Archived/inactive photos are omitted. If the chosen primary is unavailable, the first available photo is used automatically. Photos belong to the project component installation; duplicate planner instances share them. Manual planner items have no project photo attachments. Galleries load current attachments when you select the item; reselect it after uploading or editing photos.

Common object shape library

Browse the NPPSC object shape library for generic cabinets, appliances, furniture, tanks and roof equipment, with a simple box for custom objects. In Add/Edit Project Component, find Object shape, choose an appearance and save. Reopen your saved planner or use Bring in project components to refresh it. Imported shape choices come from the project; manual planner items have their own Object shape selector in the 2D planner.

Shapes use your actual zero-turn dimensions and follow the item's turn and elevation. Object front at zero turn points doors, controls or seating toward Passenger side, Rear, Driver side or Vehicle front while preserving your measured footprint. The item's existing Turn rotates the whole installation from that starting orientation and can swap its length/width extents. The 2D map shows top surface details; 3D shows the common object. Fit and overlap checks still use the full measured envelope, including space beneath table legs or between decorative parts. Shape/facing changes alone do not unplace items, change weights or invalidate scale readings.

Existing items default to Simple box. Grouped items retain one box envelope and distributed materials retain their coverage region. Unknown heights stay unknown and use a flat outline in 3D, even if a shape is chosen. Missing length or width keeps an item unplaced. A missing/retired shape falls back to Simple box. Photos, layers, layout visibility and weight inclusion remain independent; excluded items appear gray.

The standalone library lets you try demonstration measurements without saving them. Those examples are never imported into components. Shapes supply no product measurements, weight, liquid capacity, mounting requirements or operating clearances.

Installed dimensions and orientation

In Add/Edit Project Component, choose My installed dimensions in this vehicle. Length is the front-to-rear extent, width is the driver-side-to-passenger-side extent, and height is the object's bottom-to-top size. Inches, millimetres and centimetres are supported. The vehicle diagram identifies the directions; Swap length and width changes the two entered axes. Manufacturer/reference specifications remain unchanged and are not automatically interpreted as vehicle directions.

These measurements describe one item at zero turn. Each instance in the planner can turn independently through 0°, 90°, 180° and 270°. Both planners show the resulting installed extents separately from the zero-turn measurements. Elevation is the position of the object's base relative to the original floor, not part of its height.

Changing an individual item's installed dimensions marks its old placement for repositioning and resets its plan turn. Reopen the saved plan, place it again, check clearances, and save. Unknown dimensions stay unknown; reference measurements remain available until you confirm installation measurements. Grouped envelopes and distributed coverage remain plan-specific and do not inherit a stock product's footprint. Dimension and orientation changes do not change recorded component weight.

The Project components card is also where you add manual items and search the plan's item list. It is not a search of the entire shared registry. Selecting an item opens its editor. The inclusion checkbox controls whether that item participates in the selected loading; group-edit selection is separate.

Imported and manual values

Imported names, weights, quantities, status and dimensions come from the project. Unit weight and quantity stay linked to the project. Individual equipment dimensions are read-only; grouped and distributed coverage dimensions are editable in the planner. Use “Edit this project component,” correct its measurements, then bring in the components again or reopen/save. Do not substitute a guessed dimension merely to make a placement work.

If refreshed dimensions no longer fit, the item becomes unplaced so the plan can still open. Missing dimensions stay unknown. Manual rows have editable specifications. A real zero weight is different from an unknown value; empty water contents can legitimately weigh zero.

The legacy import behavior represents whole project quantities up to 50 as separate copies. To choose a different representation, edit the project installation and select Individual items, One group, or Material spread across an area. Larger or fractional project quantities share one grouped footprint. A manual quantity also multiplies weight without creating separate physical boxes. Grouped rows are an accounting convenience, not a packing simulation. If separate placements matter, use suitable separate project assignments or manual rows, and avoid counting both versions.

Cut materials and distributed weight

Record installed quantities to four decimal places. For example, quantity 0.5 of an eight-foot board contributes half its project unit weight. Use 4.5 for four full boards and half a board in the same area, or separate installation records when the areas or notes differ. Unit labels do not convert catalog measurements. Linear and area units require a project weight per selected unit or a total installed weight; a catalog roll weight is never assumed to be weight per foot.

In the project component form, choose Material spread across an area. Import or refresh the planner to get one entry for the installation. Its stock dimensions are not its coverage dimensions. Enter a coverage length, width, and position for Bedroom or Bathroom, then place the region. You can reuse a region from another material in the same build area, or explicitly apply its revised region to other distributed materials in that area. Build-area names alone do not define measured boundaries.

Choose Whole interior outline for an evenly spread material. Coverage follows flat, V-shaped and rounded outlines. Rounded coverage uses the same polygon approximation as the map. If the overall layout changes, review and confirm coverage again. The shaded region is a uniform weight assumption, not a solid object or a structural load analysis. Ceiling and wall layers can organize materials separately.

For unequal distribution, use separate installation quantities for the regions, ensuring their sum equals the amount installed. Offcuts not carried in the build do not add installed weight. Purchase costs remain separate. A total installed weight replaces quantity multiplied by unit weight; it is not added on top.

Existing placements stay intact while their placement type is unchanged. Switching representation unplaces the changed installation for review. If its old rows have mixed baseline or inclusion choices, conversion is blocked; first restore the old project placement/quantity, make those choices consistent in the saved plan, then convert.

Already included in measured baseline

Check this only when the row's weight was actually included in the baseline weighing. Its weight can still appear in the map's component balance, but it is not added to the total again. The checkbox does not deduct weight from the baseline or calculate a partial-weight difference.

Water fill scenarios

1. Add the dry tank/equipment if it is not already counted.
2. Add a separate manual row and choose “Water contents.” Enter capacity in US gallons or litres and choose fill percentage.
3. Use a documented baseline condition compatible with this extra water row. For empty-to-full comparisons, a measured empty-tank baseline avoids counting water twice.
4. Compare fill levels and capture the loading states you want to keep.

Water contents use the planner's 1 kg/L convention. For example, 20 US gallons at 50% is about 83.5 lb of water; the tank itself is separate. Fill changes the row's weight, not the displayed box height or a simulated liquid surface. If your baseline already contained water, changing a baseline-marked water row does not automatically change the fixed baseline—reconcile the weighing condition first.

Layers, mounting locations and positions

Layers organize visibility; they do not raise equipment or change its mounting bounds. For a roof vent and a panel above it, select Roof-top mounting for both and enter each base elevation from the original floor. Include measured roof thickness and mounting gaps. Standalone planning can expand the planning allowance, up to the supported limit. Linked plans use the Builder’s recorded project allowances and cannot expand them from a tool. These bounds do not approve installation clearances.

Opening clearance above an item is stored separately from its closed height and included in 3D overlap review. For a raised bedroom floor, enter its finished elevation as the raised-floor reference, then use Place base on raised floor reference for furniture sitting on it. The reference does not move framing or imply that all its weight is concentrated at the finished floor height.

Layers are selection groups. Underbody, Floor, Interior 1–3, Walls, Roof 1–2 and Exterior help you select overlapping items. Add up to 20 custom layers per plan, such as “Under raised floor.” A layer does not automatically set elevation or mounting location.

Mounting location defines the permitted area. Configure measured exterior space under Layout & baseline when needed. Allocated rectangles and height clearances do not establish mounting strength, frame capacity, obstacle clearance or legal vehicle dimensions.

Coordinate origin: The rear/driver-side corner is X = 0, Y = 0. “From rear” increases toward the front; “From driver side” increases toward the passenger side. Positions describe the near rear/driver-side corner of the rotated rectangular footprint. Elevation is measured from the interior floor reference.

Move and rotate: Use Place on layout, drag the box, or enter coordinates. The 2D map offers a 3-inch snap and zoom controls. Rotation swaps the footprint's length/width direction; it does not change the recorded product dimensions. Arrow keys on a focused item move it in 3-inch steps. Group editing moves or rotates selected rows only when all resulting footprints fit.

Your cabinet/stove example: Put cabinets on Interior 1 and the stove on Interior 2. Filter Interior 2 to select the stove, or select it from the list to bring its outline above other items. Layer filtering changes what is drawn, not the included payload weight.

Raised floors: Tanks inside the body beneath a raised bedroom/bathroom floor are Interior items, not automatically Underbody. Use a custom lower-interior layer and set the bed/shower's elevation above them. Set true beneath-platform equipment to Underbody.

Roof vent beneath panels: Use separate Roof layers and measured elevations. Selecting roof-top mounting allocates at least a known component's height as vertical planning space; verify the actual roof structure and obstructions. Changing mounting location unplaces the item for deliberate repositioning.

Included exterior items count toward weight totals and the positioned-item center. Front/rear overhang weights contribute to the nearest end region. All of these displays remain simplified; they do not calculate hitch load or certify distribution.

Axles and scale readings

Add up to three axles. Number them front to rear and enter spindle positions measured from the rear of the usable body. Record each applicable GAWR from current vehicle/manufacturer information. Show axles on map changes their visibility only; their entered ratings remain available for comparisons.

The planner compares entered measured axle loads with entered GAWR. It does not divide total weight equally between axles, predict axle loads from the red marker, or calculate hitch/tongue load from placements. When axle and tongue readings are complete, a displayed combined reading depends on those readings being compatible measurements of the same loading.

Choose suspension type, enter actual readings, add the weighing date and describe conditions. “Readings match this loading” associates readings with the current planning data; it is not independent validation of the scale procedure or a safety approval. Moving loads or changing relevant source weights/footprints can mark that context stale. Reweigh as appropriate before relying on old readings.

Project layout imports always leave recorded readings unconfirmed for the receiving plan. Review what was weighed before confirming. Torsion/equalized suspension behavior and real axle load distribution need equipment-specific assessment; consult the Dexter applications manual and the manufacturer of your actual running gear.

Compare loading scenarios

The main planning selector includes either all checked items or installed items only. An unchecked item is excluded even when installed. Layer selection is independent of both controls.

1. Prepare a loading: water fill, included supplies, placements and status assumptions.
2. Enter a loading-scenario name, such as “Travel — half water,” and click Capture current loading.
3. Change the loading and capture another name. Up to ten snapshots can be kept; capturing an existing name replaces that snapshot.
4. Select a snapshot and Apply scenario. Inspect the result before saving or printing.

Applying a snapshot keeps the current layout dimensions, exterior spaces, units, suspension and overall rating settings. It does not restore an older manufacturer rating. The last retrieved project source values are retained rather than treating a historical catalog weight as authoritative; reopen or save to refresh them from the project. If snapshot footprints do not fit today's outline, the tool asks you to resolve that conflict.

Captured snapshots stay only in the current draft for visitors. Signed-in users must save the plan to retain them. “Save as new” is useful for a separate design alternative that should not replace the original plan.

Use the separate 3D view

1. Sign in, open a saved plan, and Save any pending 2D edits before choosing Open saved plan in 3D.
2. The plan name and loading/saved status identify the same private plan. A failed load shows an error and retains the plan in Return to 2D planner; it does not open a blank replacement.
3. Choose Visible layer and Pointer action above the view. Select a visible component in the drawing, or expand Select a visible item below it. The selected name is shown above the view. Changing layers clears a selection that is no longer visible.
4. In Drag components mode, drag in Top or Perspective to move horizontally at the current elevation. With the canvas focused, arrow keys move the selected visible item by 3 inches. Choose Orbit view or drag empty space to move the camera.
5. Use Perspective, Top, Side, Front, zoom and Reset view to inspect the load. This compact view has no sidebar, component dropdown or interior-height editor. Use the 2D planner for heights, dimensions, numeric placement, unplaced/hidden items, weights, shapes and photos. Existing saved data stays intact.
6. Review overlap and missing-data notices. Save plan, wait for confirmation, then Return to 2D planner. The same plan is selected automatically. Wait for the opening message to finish. If opening fails, the error identifies the requested plan; choose another saved plan or New blank plan explicitly. A failed initial load cannot be saved as an empty replacement. If edits are pending, Save or explicitly discard them before returning.

The 2D map keeps its selected-item editor nearby and its optional system-route overlay collapsed until requested. The compact plan-name/save bar stays available while working through the map and item editor.

Known-height items are simplified solid boxes. Unknown heights appear as outlines; the renderer does not invent a product height. Overlap checks consider included placed items with known dimensions, including items hidden by the layer filter. A cabinet is drawn as a solid box, so an inset stove may produce an advisory overlap even though the real cabinet has a cutout.

This is not automatic packing, stacking-support analysis, roof/frame engineering, suspension simulation or rollover prediction. A visually clear layout does not demonstrate physical installation clearance or safe operation. The view does not calculate vertical center of gravity.

Shared project measurements

Open Layout & Baseline in your project navigation. The dedicated Layout, Baseline & Scale Readings page holds usable dimensions, front shape, exterior mounting allowances, baseline weight and its contents, manufacturer GVWR, axle positions and ratings, suspension, weighing date and recorded axle/tongue loads. Only the current Builder edits this record; active co-builders and assistants have read-only access. Archived projects are read-only.

Linked 2D and 3D plans load these facts when opened and saved. The 2D planner shows them above the totals and Planning data review, with a link to the project page. Its standalone measurement cards are hidden for linked projects. Use Refresh project information to load a Builder update into an open 2D draft. A stale open plan cannot save over newer project facts; reopen it and review the updated loading.

Personal planning limits, units, axle display, included items, arrangements, routes and loading scenarios stay in each private plan. Saved scenarios cannot restore superseded project measurements. Existing standalone plans retain their measurement controls. A linked plan without a recorded project layout must have the Builder complete the project record before it can be saved.

When project measurements change, old scale confirmations are cleared. Placements that no longer fit are unplaced on reopening or refreshing, including manual items; their included weight still counts. Whole-area materials adapt to the updated outline. Route coordinates are retained for review. No private saved plan is automatically chosen as the authoritative project record.

Plumbing and electrical routes

Open the separate Plumbing & Electrical Routes tool, sign in and select your saved plan. Add a plumbing or electrical run, give it a name, and choose Cold water, Hot water, Drain, Plumbing vent, DC electrical, AC electrical, or Signal / data. These diagrams belong to your private plan; they do not change project components.

1. Enter the two endpoints. X measures from the rear toward the front, Y from the driver toward the passenger side, and Z above the original floor. The fields follow your plan's inches or millimetres setting. Negative elevations support underfloor runs.
2. Use Insert point after a numbered point to add a bend or riser, then edit its coordinates. Points connect in list order. Remove a point to simplify the run; at least two must remain.
3. Choose Planned or Installed, and use notes for endpoints or installation details. Coordinates remain fixed when equipment moves; review the run after moving its connected equipment.
4. Choose Show system routes to hide all routes, show plumbing, show electrical, or show all systems. Individual runs can also be hidden. The routes tool shows planned and installed runs for editing; the weight planners’ installed-only loading hides planned runs. Component-layer filters operate separately.
5. Save the plan, then open it in the other planner to see the same routes. Captured loading scenarios also preserve their routes. The routes tool supports Undo/Redo. Both weight planners offer a read-only route overlay; route creation, deletion and point editing belong to the dedicated tool.

Drag the selected route’s numbered points. Top view moves X/Y; Side moves X/elevation; Front moves Y/elevation. Arrow keys and numeric fields support keyboard editing. Snapping uses 3 inches or 100 mm; turn it off for finer positioning. Top drags preserve elevation. The component layout overlay can be hidden independently and is read-only. Save before switching tools, then reopen the same plan; simultaneous tabs do not synchronize automatically and stale saves are rejected.

The 2D map shows a top-down projection. Crossing lines do not imply a junction, and vertical segments can project onto one point. The 3D view uses elevations and draws routes through objects as a schematic overlay, making concealed runs readable. Colors and dashed lines identify diagram types, not installation color standards.

Drawn length sums straight segments in three dimensions; it excludes fittings, bends and purchase allowance. Add pipe, cable and fitting weight as components. Routes add no mass, change no scale readings and do not calculate sizes, flow, slope, voltage drop or installation clearances.

Plans support 60 routes, 40 points per route and 600 points overall, subject to the existing saved-plan size limit. Coordinates outside a changed layout are retained and flagged for review. Older plans open with routes hidden. Print plan includes currently visible route diagrams and their coordinate details.

Review the data and keep a report

Understand the map and review panel

The Planning data review panel highlights missing weights, footprint dimensions, heights, placements, ratings and scale context. A complete set of entered values is still only a record of your inputs, not proof they are correct or that the build is safe.

Known total and remaining payload require a measured baseline. Unknown added weights make the known total incomplete, so remaining capacity is an upper bound. Unknown individual weights on already-weighed baseline items still make the component balance incomplete. Unplaced known weights count toward payload but do not appear in the map's positioned balance.

Density assumes weight is spread evenly across each visible footprint. The red marker and driver/passenger/end-region totals use known positioned component weights. They omit unknown/unplaced contributions and do not locate the baseline chassis mass unless you separately modeled it. Neither display is the complete vehicle's center of gravity.

Print or save a PDF

1. For a linked project plan, reopen or save to refresh project specifications, then verify the loading and measurements.
2. Choose the loading and visible layer you want documented. The map reflects that visible layer; total weight still covers the selected included loading.
3. Click Print plan. Allow the report window if your browser blocks it.
4. Check totals, data gaps, ratings/readings, the map and item table. The table distinguishes included/excluded and baseline-treated rows and shows dimensions, layer/mounting and coordinates.
5. Choose Print / Save as PDF and use your browser's printer or PDF destination. Keep it with the appropriate weighing notes and build documentation.

A printed report is a dated snapshot of the active draft/loading, not every captured scenario or a live specification feed. Its footer contains NPPSC's website, slogan, references and planning limitations. Share it as documentation without presenting it as a safety certificate.

Troubleshooting

Choose a finalized 3D appearance

Open Catalog & items to select a planning item, then Selected item and Browse finalized models. Search or choose a category, inspect the preview and sizing policy, acknowledge the generic-model review, and choose that catalog version. Save the plan to retain the choice. Clear the choice to return to the usual planning shape.

The water tank, base cabinet and equipment enclosure families share their finalized appearance with the 3D Builder. They do not share your planning records: choosing artwork does not change this plan's weight, measured dimensions, load treatment, placement or project records. A rig and payload plan remain independent.

Your plan retains the version you chose; later catalog updates do not silently replace it. Generic registry associations are optional suggestions, not product specifications. Private garage construction is not exposed through this picker.

Enter the real item measurements. If dimensions are unknown, a fixed model does not fit, a size is outside the family's range, artwork cannot load, or detail would exceed display limits, the planner uses its measured outline/envelope and explains the fallback. It keeps the planning measurements instead of shrinking or clamping them to fit artwork.

On a wide screen, collapse workspace panels to their icon rails. On a phone, use the Catalog & items and Selected item drawers; Close preserves the form. Save controls and feedback remain reachable in the drawer. Save before opening the separate 3D view, and reopen the plan when returning to 2D to see saved 3D changes.

References and current verification

Links reviewed for this guide on October 12, 2026. Availability does not establish that a document is the latest edition or applies to your specific vehicle. Recheck editions, current rules and manufacturer instructions before using them.

• NHTSA certification-label interpretation 001059GF — historical label guidance; not a current approval for your build.
• Current eCFR certification-label provisions, 49 CFR 567.4 — confirm applicability and the current text.
• Dexter axle/suspension applications manual — verify current equipment-specific documentation with the manufacturer.
• NHTSA load-securement guidance — review restraints and actual operating conditions.

Obtain current advice from the relevant manufacturers and qualified vehicle/trailer professionals when modifying a load-bearing or safety-critical system. No warning-free planner screen or printed report replaces that assessment.

NPPSC
Build it. Document it. Share what works.

Furniture catalog models

Catalog names start with the item type, followed by a useful description, such as Bed — With mattress or Sofa — Straight. The separate Generic planning model label explains its status. Search accepts the earlier names and words in any order. Renaming catalog labels does not replace saved model versions or change names you have given placed items.

The finalized catalog includes a bed platform, a bed with mattress and bedding, a backless bench, a straight sofa and a rectangular table. Each has a displayed resizing range; legs, tabletop/deck thickness and cushion details retain their characteristics within that range. The bed with mattress uses an overall envelope including its headboard and pillows. Choose the platform-only model for a bare bed frame.

These generic illustrations do not supply weight, structural ratings, passenger-seat approval or folding/conversion mechanisms. Measure the complete real item and enter its real planning weight. Furniture construction templates are not included in these catalog versions; their previews state the customization policy. A selected catalog version stays unchanged when other versions are published, and rig and payload planning values remain independent.

Find Registry components with a 3D model

A 3D model available badge identifies a reviewed link between a generic Registry component and a finalized catalog model. Preview opens a read-only model; sign in to view it.

When adding the component to a project build area, open Object shape settings. A single approved model is selected initially; you can choose Use ordinary object shape instead. Multiple linked models require your choice. Existing project components are not changed automatically: edit their Object shape settings to choose a model.

Enter the component’s actual installed length, width, height and weight in the project. Import the project into Weight & Payload. Individually placed components use the captured model when those measurements fit its resizing policy. Unknown dimensions, unsupported sizes and grouped placements keep the measured envelope; they never borrow measurements or weight from a generic model.

Project choices capture a specific finalized version. Publishing a newer catalog model does not replace that version. Saved payload appearances remain independent: you can select another model, clear it, or choose Use project appearance choice to deliberately use the project’s current selection. Later project or garage edits do not rewrite a saved appearance.