I purchased an RV-760-LMT recently and have used it on two trips. Good experience, and I like the larger 7" display. I have a RAM 3500, and the mounting position on the windshield places the unit pretty far away. The existing database of CGs seems very complete.
The only negative I've seen with the unit is the automatic traffic rerouting if you are using it for RV use. I disabled that feature because once it tried to take me pretty far out of the way due to moderate traffic congestion. I would have done it in a car, but dragging the fifth wheel behind me, slow traffic was better than the alternative.
Got mine from GPSCity. Quick delivery/good service.