Due to the time and effort to rebuild my current camper I am again considering building a camper from scratch, and using the truck camper for parts. I have to take all the siding off the camper, got the left side done today. Many of the 1x2s need replacing, as well as the only 1x4 (one on each side), which supports the over the cab bed. I removed the 1x4 today and found that it is stapled to every joining 1x2 on the inside as well as the outside. It is also glued to the interior 1/8" plywood, so delaminated part of that when I pulled it off. About a 1/3 of that plywood is rotten and should be replaced, but there is no way to do that without removing all of the interior cabinets and the bathroom. It has a vinyl covering on the inside, which is OK, so I could possibly just glue the ridgid foam insulation directly to the plywood, or whatever is left of it and it might be OK. I was planning on putting Lauan plywood over the insulation, under the siding, so it would still be stronger than before.
I had the thought today that it might be easier to build a whole new camper rather than try to rebuild the walls of the current one. If I made it the same size and basically the same layout, I could reuse all of the components of the old camper, cabinets, shelves and closets, bathroom, bed, appliances, even the wireing and the plumbing. It looks like it would be fairly easy to change from a rear door to a side door at the same time, which would be an added bonus.
Something more to think about anyway!
On a side note, I bought a used mtn. bike today, it is a Schwinn S-30 full suspension, aluminum frame, for $75. The seller said he had only ridden it a few miles - it looks brand new. They aren't a very expensive bike, but rides and shifts good, and it perfect for what I want it for. After a few crashes and broken items (on me, not the bike) a number of years ago, I don't expect to be doing much technical single track anyway.