Full-term travelling with an older RV

Think twice. Then think again. As mentioned, water damage is the kiss of death for these older units. If you think there's a little, there's a lot. As soon as you rip something out, you can expect to expose additional problems you didn't even know you could have. With an older motor home, you get all that and the additional expense of an old drivetrain, fuel system, tires, engine transmission, brake system, suspension, etc. RV A/C units and other mechanical parts of the coach are expensive to replace.

I would hesitate to do this at all, and I have the skills to do that kind of stuff. I believe you'd be further ahead to buy something newer.