Design Applications

What Is a Floor Plan in Designing?

A floor plan is a scaled diagram of a room or building viewed from above. It illustrates the horizontal relationships of interior spaces, walls, and features at a single level of a structure. Floor plans are typically drawn in orthographic projection and usually represent the layout as if viewed from approximately 4 feet (1.2 m) above the finished floor.

The level of detail in a floor plan depends on the design phase. Early schematic plans may show only major spatial divisions and rough square footages, while construction‑ready plans include wall types, dimensions, fixtures, finishes, and electrical symbols. Floor plans may also include notes, material callouts, and renderings depending on the intended use.

Applications I Use for Floor Plan & Design Work

Layout

Your image shows:

  • A V‑shaped front layout for water tanks
  • A bathroom zone directly behind it
  • Shower on one side
  • Toilet on the opposite side
  • Tank depth around 3’11”
  • Total front section tank depth 8’5″
  • Another tank 3’11” behind the bathroom

This is perfectly aligned with your trailer’s:

  • 8’5″ V‑nose width
  • 18″ V‑nose depth
  • 4’5″ angled side walls
  • 8’1″ finished interior width
  • 21’2″ total interior length

Your drawing is essentially a scaled architectural version of your trailer’s front 8–9 feet.

 

Working interior & axes

Working interior & axes

  • Finished width: 97″ (X = 0″ driver wall → 97″ passenger wall)
  • Total length (with V): 254″ (Y = 0″ nose point → 254″ rear)
  • Rectangular box starts: Y ≈ 18″

1. Front bench / tank cabinet (under the “seating” concept)

This is your front wrap cabinet that visually acts like a bench and structurally hides the three tanks.

Cabinet footprint:

  • X = 20″ → 77″
  • Y = 10″ → 60″

That gives:

  • Room for the V‑nose angle at the very front
  • Depth for tanks + framing + access
  • A “bench” feel along the front and slightly back into the rectangular section

2. Tank positions inside that cabinet

Using:

  • 50 gal fresh: 22.25″ (X) × 14.25″ (Y)
  • 30 gal grey: 17.5″ (X) × 12″ (Y) each

All three centered left/right within the cabinet, left → right:

Left grey (30 gal):

  • X = 20″ → 37.5″
  • Y = 24″ → 36″

Fresh (50 gal):

  • X = 37.5″ → 59.75″
  • Y = 24″ → 38.25″

Right grey (30 gal):

  • X = 59.75″ → 77.25″
  • Y = 24″ → 36″

All three sit fully inside the front bench/cabinet zone (X 20–77, Y 10–60).

3. Shower (driver‑side, just aft of tank bench)

To echo that render—shower on one side, toilet on the other, bench/tanks in front—we’ll keep the shower slightly driver‑side, just behind the tank cabinet.

Assuming 36″ wide × 24″ deep:

  • X = 24″ → 60″
  • Y = 60″ → 84″

That:

  • Keeps it aligned with the tank cabinet
  • Leaves a clear passenger‑side path to the toilet
  • Gives you a nice “front bathroom zone” feel

4. Nature’s Head toilet (passenger side)

Planning box: 19″ wide × 21″ deep

Place it on the passenger side, roughly opposite the shower, with some space between toilet and front bench.

  • X = 72″ → 91″
  • Y = 60″ → 81″

So:

  • You walk into the front area
  • Bench/tank cabinet is visually ahead/angled
  • Shower is front‑left (driver side)
  • Toilet is front‑right (passenger side)

5. Quick copy block

Front bench / tank cabinet:

  • X = 20″ → 77″
  • Y = 10″ → 60″

Left grey tank (30 gal):

  • X = 20″ → 37.5″
  • Y = 24″ → 36″

Fresh tank (50 gal):

  • X = 37.5″ → 59.75″
  • Y = 24″ → 38.25″

Right grey tank (30 gal):

  • X = 59.75″ → 77.25″
  • Y = 24″ → 36″

Shower (36″ × 24″, driver side):

  • X = 24″ → 60″
  • Y = 60″ → 84″

Nature’s Head toilet (passenger side):

  • X = 72″ → 91″
  • Y = 60″ → 81″

Tanks

Fresh & Grey Water Tanks for CTC Build

I plan to use these tanks as the core of my fresh and grey water system for the CTC build.
They were chosen for their durability, simple rectangular geometry, and reliable sizing that fits the layout of my front tank cabinet.
These specs will be used throughout my planning process for weight distribution, plumbing routing, and cabinet design.
The dimensions and capacities listed here reflect the exact tanks I will install in the trailer.


50 Gallon Fresh Water Tank — T5000BPK

Brand: classAcustoms
Model: T5000BPK
Capacity: 50 gallons
Material: Polyethylene
Product Link:

View on Amazon

Dimensions
  • Length: 14.25"
  • Width: 22.25"
  • Height: 38.25"

30 Gallon Grey Water Tank — T3000‑BPK (×2)

Brand: classAcustoms
Model: T3000‑BPK
Capacity: 30 gallons each
Material: Polyethylene
Product Link:

View on Amazon

Dimensions (Each)
  • Length: 12"
  • Width: 17.5"
  • Height: 34.5"

Finished interior dimension spec – for planning & layout

📐 WORKING INTERIOR SPACE

Rectangular Interior (Finished After Front/Back Wall Build‑Up)

  • Length: 19′ 8″ (This is the 20′ interior minus 2″ front wall and 2″ back wall)
  • Width: 8′ 1″ (97″) (This already includes your 2″ per‑side wall build‑up — no further subtraction)

V‑Nose Extension

  • Centerline depth added by V‑nose: 18″
  • Side wall length from the 20′ mark to the point: 4′ 5″
  • Base width of V (same as trailer width): 8′ 1″ (97″)

Total Finished Interior Length (Centerline)

19′8″+18″=21′2″

➡️ Total finished interior length including V‑nose: \\21′ 2″ (254″)\\**

Finished Interior Height

84″−4″ (floor)−2.5″ (ceiling)=77.5″

➡️ Finished height: 77.5″ (6′ 5.5″)

📏 SUMMARY BLOCK

Finished Interior Dimensions (V‑Nose Trailer):

  • Rectangular Length: 19′ 8″
  • V‑Nose Depth: 18″
  • Total Length (Centerline): 21′ 2″
  • Finished Width: 8′ 1″ (97″)
  • Finished Height: 77.5″ (6′ 5.5″)

Build‑Up Used:

  • Floor: 4″
  • Ceiling: 2.5″
  • Front Wall: 2″
  • Back Wall: 2″
  • Side Walls: 2″ per side (already included in the 8’1″ width)

The Trailer

8.5×20 Charcoal Enclosed Trailer with Blackout Package (2) 5200lb Axles Storage

 

8.5×20 Charcoal Enclosed Trailer with Blackout Package (2) 5200lb Axles Storage

8.5×20 Charcoal Enclosed Trailer with Blackout Package (2) 5200lb Axles

Features:

  • Charcoal Screwed Exterior – Durable aluminum exterior with a sleek charcoal finish provides a professional appearance while resisting corrosion, fading, and daily wear.
  • Spring-Assisted Loading Ramp – Full-width rear ramp allows smooth loading and unloading of cargo or equipment, with spring assist for controlled, effortless operation.
  • 7′ Interior Height – Comfortable interior clearance allows easy movement, loading, and organization of cargo.
  • (2) Greaseable 5,200 lb Axles – Tandem heavy-duty axles with greaseable hubs provide reliable towing, increased load capacity, and long-lasting durability.
  • 24″ Black ATP Stone Guard – Aluminum tread plate protects the front of the trailer from rock chips, debris, and road wear, extending exterior life.
  • Includes Safety Chains, Jack, and Coupler – Essential towing hardware ensures safe and secure connection to your vehicle.
  • Built-In Side Vents – Integrated vents promote airflow, reduce heat and moisture buildup, and help protect cargo inside the trailer.
  • Heavy-Duty Plywood Walls and Floor – Reinforced plywood interior adds structural strength and supports heavy cargo loads while resisting wear.
  • 15″ Wheels and Tires – Durable wheels paired with highway-rated tires ensure stable handling, long-lasting performance, and safe towing.
  • (4) D-Rings Built into Floor – Recessed steel D-rings provide secure tie-down points for safely transporting equipment or cargo.
  • 36” Passenger Entry Door – Convenient side door allows easy entry without opening the rear ramp, improving usability and access.
  • Brands May Vary Based on Stock – Trailer specifications remain similar even if certain components or brands differ based on availability.

Brands may vary based on stock. Similar specs are used across all brands.

MoreInformation

Manufacturer: SLE Enclosed Trailers
MPN: 8.5X20CHARCOALBLACK
Condition New
Shipping Options Store Pickup / Delivery Only Call For Price
Load Capacity 6490lbs
Trailer Interior Width 8′ 5
Wheel Size 15”
Trailer Interior Length 20 ft
Floor Type Plywood Flooring
Hitch Type Bumper Pull
Axle Size two – 5,200lb
AC / Heat No
Roll Out Awning No
Interior Height 7′
Exterior Metal Screwed
Flood Lights No
Extended Tongue No
Warranty 1 Year Limited Warranty