Cargo Trailer Camper Conversion – Black Water Tank Install
As part of researching different plumbing layouts for this build, I found a helpful reference video titled
“Cargo Trailer Camper Conversion – Black Water Tank Install” by Be Free Builds.
This video walks through the process of mounting a black water tank under a cargo trailer and adding the basic plumbing components needed for a toilet installation.
You can watch the video here:
Cargo Trailer Camper Conversion – Black Water Tank Install
Black Tank Installation on Custom Cargo Trailer Camper Toy Hauler RV DIY Van Conversion Bathroom
What the Video Covers
The creator demonstrates the full installation process for an under‑mounted black water tank, including:
- Tank positioning between the trailer frame rails
- Mounting method using metal straps and wood blocking
- Cutting openings for the toilet inlet and drain fittings
- Basic plumbing connections for the toilet and venting
- Securing the tank to prevent movement during travel
The video provides a good visual reference for how a black tank can be mounted beneath a cargo trailer, especially for DIY conversions where space is limited.
Key Takeaways
- Frame spacing matters: The tank must fit cleanly between the frame rails without interfering with crossmembers.
- Strap protection is important: Several commenters note the need for rubber padding between metal straps and the tank to prevent wear over time.
- Vent routing: The video shows the tank installation but does not go in-depth on vent placement; this is something to plan carefully.
- Ground clearance: The tank sits below the floor line, so clearance must be considered to avoid bottoming out.
- Wood vs. metal bracing: Some viewers recommend replacing wood blocks with steel for long-term durability.
Why This Video Is Useful for My Build
Even though my build will not use a black water tank (composting toilet), this video is still valuable for understanding:
- How tanks are mounted under a cargo trailer
- How plumbing penetrations are cut and sealed
- How much space tanks require beneath the floor
- What to avoid (sharp edges, unsupported weight, low clearance)
This reference helps inform decisions for my fresh water and grey water tank installations, as well as general under‑frame routing and protection.
Additional Notes
The comments section includes useful feedback from other builders, including suggestions for:
- Using rubber padding or tire rubber between straps and tank
- Upgrading to steel bracing instead of wood
- Ensuring proper venting through the wall or roof
- Checking tank clearance when fully filled
As I continue planning the plumbing system for this build, I’ll reference this video for mounting ideas, strap design, and under‑frame layout considerations.