While searching for a used RV we checked many thoroughly. It wasn't uncommon to see roof leaks that had softened the roof AND the wall area at the floor.
The water that comes in the roof needs to go somewhere ... usually down. Once down, it pools at the floor structure and starts rotting that area too. One was so bad the wall was rotted about half-way up ... my thumb indented the wall when I pressed into it! The floor under the dinette seat was rotten/soft. Wouldn't have noticed it if we hadn't been overly curious about the discolored vinyl flooring.
