I did repairs on campers before, but this year I parted out 2001 Lance 1161.
Camper was in relatively good condition, but with faded exterior and I used interior in my small bus conversion.
So the "stapled toothpicks" frame is having amazing strength when you glue plywood on both sides. Even styrofoam sandwiched in floor and roof adds quite a bit to integrity.
The 99% issues are triggered by leaks. Single sheet roof helps, but not when you "forget" to seal awning trims.
Even I inspected and sealed all holes that would make camper windy, during demolition I found more big holes for holding tanks plumbing that would allow not only wind, but also critters to enter.
I also collected about 1/2 gallon of factory sawdust & other construction debris.
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