Follow-Up:
Your problem is a motorhome problem and not really a specific Rialta problem. I have had my transmission leak on my Rialta (which is a problem because it's supposed to be a "sealed" system, doesn't even have a dipstick!), I had my A/C compressor fail almost immediately after purchase, and I've had an entire set of Contrans tires replaced under warranty with the new Vancos (which are much better tires). I had more problems with my Thor Chateau Class C motorhome, and if you frequent other RV message boards, you'll see that quite a few makes/models of motorhomes have similar problems. I'm not saying this to tell you that "you don't have a problem" -- because obviously you do. However, keep in mind that trading your Rialta for a different motorhome might make your situation worse instead of better. Visit the link below -- it has some great Rialta resources and methods of communicating with hundreds of other Rialta owners to help you keep your Rialta on the road.
Here is a link that might be useful: MotorHomepage's Rialta Resource