Pay to run the VIN and see what the history of the RV has been. Make sure there is not an unusual break in the sequence of title holder when it shows the mileage. I ran into this recently and the dumb *** seller (a small dealer) didn't have a clue what was going on or didn't care to find out. I just bought a beautiful 2002 Newmar Mountain Aire 3778, single owner with 40000 miles on it. Lucked into a "cream puff" and love the unit. Definitely hire a RV Tech to go over the unit top to bottom with a comprehensive checklist. This will be way above the joke of an inspection that I got from a dealership that has the initials CW. This inspection is NOT going to be a chassis inspection, looking at the engine, drive train, etc. You will have to pay more to a Certified Inspector at a reputable RV dealership. Check out their prices first and what is the scope of the inspection and make them show you the checklist. Your initial inspection is going to pick up roof leaks, neglect, etc. and will probably lead you to make an early decision. Buying a used RV takes a lot of work and if you perservere, you will find that gem. As far as a Newmar, they are a great company with a great reputation. I notified them of my ownership and they promptly got me into their system. Run the NADA value numbers to look at a starting point for negotiation and look all over the internet for comparable units, features and prices. My RV had an average retail of $ 51,000 and it was definitely not average and I paid $ 38,000, so I have a nice equity cushion for the future.
Another important thing to look at is the condition of the manuals, any invoices that might have been saved denoting any problems with the systems and just a history of what work was done. In my case, the only owners were an elderly couple and the recording keeping was not very good, but I did see some recall notices from Workhorse that had been completed. Tight paperwork will help sell your RV in the future because it shows you care.
Good luck, Eric Schrader, Canton, Ga.