I’ve owned a lot of old rigs, I can’t justify the $$ for newer ones, worst investment ever.
There are three main things that most often put an older RV on the side of the road.
Transmission, radiator, tires.
No matter what else you save your money on, the first thing you should do is get a good transmission, replace the radiator no matter how fine it looks, and make sure you have good tires.
Heading out on the road in a heavy old vehicle with an unknown old transmission is a good way to have a bad trip. But, it does generate good stories!
I could entertain you for a while...