Follow-Up:
Kodiak makes something similar (not sure if that's the namebrand or the model), RoadTrek (smaller Class B), and I think one by the name of Leisure Travel. If you want something similar to the Rialta, you should probably start looking at Class B motorhomes. They will most likely be smaller, but I've seen a few that are about the same size and are probably really Class C's as the Rialta is. I think Coachman makes a small Class C or large Class B that looks a lot like the Rialta but has a Ford or Chevy chassis instead of the VW one (which would eliminate a lot of support issues).