Service in Tucson
This is a late answer but this may help. I live in Casa Grande (between Tucson and Phoenix). In searching for a place to service my '99 Rialta, I only found one dealership (Volkswagen) with a lift strong enough to lift the Rialta. This is important for proper service and repair. Not sure about Tucson but the only other place in this region is "Chapman Volkswagen of Scottsdale". I would ask for Justin Mitchell as he usually handles the Rialta. They do good work and I have had quite a few issues resolved. Bear in mind that they will ONLY handle "Volkswagen" ailments. Anything behind the driver's seat that is Winnebago related would have to go to Winnebago. Case in point; I had my Motoraid heater core leak and they could not (would not) fix it. Wherever you call make sure they can "lift" the Rialta in their service bays.