The biggest problem you'll have is with all the little stuff (not the big ticket items) especially if they're plastic. At that age they will break or crack easily. For example the defroster vents for the front windshield. They're in the sun and rot out pretty fast. Use that example and call around to see how easy it is to replace them. It might give you some insight on what's ahead if you buy the rig and want to cherry it out.
I got stuck in Carthage, MO for thee weeks (weather) and spent a fair amount of time in the RV salvage yard. Yes, they have a ton of Class A's, but they are not going to have the exact make and model you may have. Back to those vents.
The reason people buy Winnebago is because they carry a large supply of parts to support their customer base. They are the only one's I know that do that.
