Current model Rand McnallyJust bought this one. Drove to Stanford Hospital from North of Sacramento. I used our in dash gps and this one at the same time. The Rand was programmed to know we normally drive a 40 footer and pull a toad. It took us in what I thought was an unusual route around the hospital to our hotel. I realized it took us that route because there was no way we could have made the U-turn that would have been required if we had it running in the car mode versus the rV mode. Our dash gps was telling us the shorter way but not the best way if we had been in the RV.
There are threads about this so do a google search for Rand McNally
Good Sams gps for lots of current info. I lover our Garmin Nuvi and have bought at least 6 of them. They however do not have the ability to specifically program them for RV issues.