R-vision was bought by Monaco Coach Corp, who then used them to make some Holiday Rambler models, went belly up. Their assets were bought by Navistar and they were renamed Monaco Coach LCC. As a part of the bankruptcy Navistar dropped warranty coverage of the "Old Monaco" coaches, there are lots of threads about this on this website. That is their recent history in a nutshell, I'm sure I'm leaving lots of details out.
IMHO, even if Monaco LCC cannot help you, you still should not be too concerned about buying this particular "Orphan Coach". The gas chassis is either Workhorse or Ford, both still well supported, the appliances, windows and other equipment in the coach is supported by their manufacturers like Dometic, Norcold, RVProducts, Carefree, etc. who are still in business supplying spare parts and service.
A lot of the value added directly by R-vision is in the coach framing, roofing, etc. If you're handy you can maintain and repair that yourself, if not there are many RV service shops which will do the work.
Whatever you do, if and when you chose a coach go over it with a fine tooth comb and ask lots of questions. Search this website for "PDI" forms, they will point you in the right direction as far as inspecting it.
BTW, our first RV was an R-Vision Trail-Lite, it was a great trailer, the only problem we had was the roof A/C was not tight enough so we got water on the floor after a hard rain. After we tightened that up it was fine!
Stewart, Brenda and kids
2008 Newmar Canyon Star 3410