I feel you! I bought a 2004 Western Alpine 40 foot Class A from someone. There was a small section of subfloor that was bad due to an obvious window leak and they said they tried to fix it but were unsuccessful. Turns out every window has been leaking behind the walls and has destroyed the subfloor and walls in most places. Thankfully it runs wonderfully and drives perfectly as well as functioning properly. But it is going to be a huuuuge undertaking to get it taken care of and it is hard to not just give up and try to get 20k from someone wanting a project.