AXS
Planning to build a house on wheels, or tiny house as it is also called, in the spring.

The base is a boat trailer measuring 2.7x8m. For the floor, not much framing or boards are needed to make it stable yet lightweight. But how do I handle the walls?

Most others seem to build a regular wall with a wooden frame, OSB, drywall, and a wooden facade. Sounds heavy to me.

How would you build a wall that is as light yet stable as possible?

My plan is as follows, from the inside out:
-Plywood about 12mm.
-Fabric.
-Metal studs 120mm. Wooden studs where needed (around doors/windows, for example). Insulation like cellulose.
-Fabric.
-Wooden facade. Tips?
 
Caravan manufacturers use a sandwich method. It might be possible to glue plywood on both sides of styrofoam and then place a 45x95 wooden frame along the outer edge to be able to attach to the floor and ceiling. But I've never done this myself, so I'm just brainstorming.
 
If you're looking to save weight, sandwich panels are the way to go. Foam board + glued sheets. The sheets themselves become extremely stiff, so really, it's just the connection to other parts that needs to be done well.
Then the question is how much insulation you need, I would consider more high-value insulation to reduce the thickness.

Cellulose weighs more than mineral wool, so it feels a bit backward ;)
 
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