After reading it. Your main concern is the leaks. Any RV has many different places for it to leak. Too many people don't do maintenance on all caulks and roof. That is why they leak on older models or even on new models. Your best bet is to find one that was garage kept or well maintained unit. So to answer your questions, yes they all will leak like house if it was not maintained. Keep looking for one that was taken well care.
As for more information on class A and Class C, you are in the right spot. Ask any questions you may have, but start a new thread for each one. I would also recommend YouTube
Good luck and welcome to the forum.
