Well, this is sort of relevant or at least bits of it may beI built this mobile darkroom for making wet plate images in the back country. It has variable height air bag trailing arm suspension and is light weight and strong.
A mate donated a 1974 crusader caravan which I had thought would be a good start but once inspected it turned out that only the chassis base was worth while - at least it was square. Re jigged it a little to be narrower (same width as 4x4 ute) and built everything on that back up. The frame work is wood (hardwood marine ply base), insulated with extruded poly and clad inside and out with signboard (alluminium plastic composite 4mm thick). The sign board is glued to the framework with a flexible glue and it's this skin that makes it so resilient to abuse and so strong.
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