History of U Haul camping trailers

I have a Fiberglass project going. It's a 1970 Campster. It's been in mothballs since the beginning of winter but I'm about to dive back into it. I have a thread going on it here. This one is what is known as a Clamshell camper. Two molded pieces welded together top and bottom with the seam going around the middle. Anyhow there are many downsides to fiberglass campers. One is that most are covered with carpet inside. Not a very good insulator. For this reason I am sandwiching mylar insulation between Birch Paneling and the walls on the inside. That will give it some R factor. At least better than carpet. Another thing is that they ALL fracture with spider fractures at the door hinges. Dings are easily repaired though. The all have problems underneath where the chassis connects to the body for obvious reasons. That can be somewhat dangerous. So you really need to keep up with periodic inspections of all these areas. But they keep the rain out and are very light in weight. That is probably the biggest on the list of Pros. A 6'3 guy working in there? Not so good. It has a pop top which is great and helps a lot. But still  a little crowded for my tastes.