Me too! I have a 1984 Itasca with a Chevy 454 engine (I think) that started burning up belts. I was in the midst of having some other work done at truck place since I didn’t have the proper tools or time to lift the rig to changes tires etc…  Took it back to them three times with busted belts, each time they told me something new they’d tried.  I don’t think we ever got to the bottom of it, we wound up buying a new RV around the same time.  But I’m about to pull the old one out of mothballs and I’ve been wondering what the belt problem could be or if it’s finally fixed.  I’m curious to hear your outcome.