There is an exterior steel wall that will shield the exterior wood wall and windows from all the off-roading hazards, and in the raised position the steel will act like an awning. I will attempt to make the steel wall waterproof with weatherstripping, but I cannot guarantee that. Thus the exterior wood wall will be mostly dry, but I would assume it will get wet. The exterior wood wall will be screwed to a wooden interior structure, not glued, because I need it removable for service. I'm thinking of doing a double wall thickness with 1/2" foam insulation.
The floor of the space will be simple exterior ply because it will be covered in a matress. The interior walls... I'm still trying to decide between having them finished in a nice wood, or just use regular plywood and cover them in some sort of fabric or carpetting. The space is for kids. I want it to be "warm", since the rest of the trailer is a bit of metal beast.
I guess, I should expand this to questions about the kitchen side, which will also be done in wood. What are people using for the cabinets?
Part of the problem, I think, is because in Canada we don't have easy access to too many varieties of plywood.