A Rialta (Class C) might have been something to consider 15 years ago, but with all the nice used Class B's out there now I don't see a reason to take a chance on one of these. Unless your a very good mechanic, have time to hunt down expensive, and sometimes almost impossible to find parts, I don't think a Rialta is a very good purchased.
The newer ones had pretty good power, but that's because the Rialta had very limited CCC's. I think the standing height is only 5'10" so a lot of people will have to bend over.
A VW dealer won't touch it, so one would have to find a mechanic who has a lift big enough, and the knowledge to repair it.
I think the under built rear ends are one of the major repair problems, and costly.
I have heard brakes, and even tires can be had to find.
If you want a hobby, and have time, and some extra money, a Rialta might be a consideration, but not for the average RVer.
I did a Google search but could find nothing on the Rialta being towed 4 down.