Has anyone done or considered making the wall framing out of plywood. Similar maybe to some of the Serro Scotty walls but I was thinking more like cutting the plywood out to the point it looked like framing (lots of cutouts) and actually sandwiching 2 sides together around some rigid insulation.
A few issues I can think of:
1.) may be somewhat heavier 2.) plywood seems more susceptible to rot to me, but I guess the trick is to keep it dry anyway 3.) may be harder to make and I wouldn't get to use Kreg tool, although I do think this construction could be more solid. I think the construction ease may be a tradeoff between lots of cuts and lots of joining. 4.) not sure how I would run wiring, could be done but would have to do some planning. May have enough cabinetry, etc, that I don't have any wiring within the walls anyway, haven't thought that part through (yet).
I will probably just build the frame back using similar boards and method as originally done, but doing lots of evaluation before I get started.
I detest plywood walls. They are harder for me and you're right, difficult to wire. The ply trailers I've had have been frame ups, because you can't piece the plywood wall. They tend to rot along the bottom.
Also, your trailer is more complicated than a canned ham and really would benefit from framed walls, for the wiring alone. It has both 110 and 12 volt... Inlets are easier to install and backer boards provide a lot of strength.