I want to buy a 7 inch RV GPS. I see that both Garmin and Magellen make one for RV'ers. In reading the reviews, it appears to me that there are a lot of bugs in the Magellen but it is on sale now at...
I use a Samsung Note 10.1" tablet with Co-Pilot gps app. The app cost last I checked $9.99 and it has a RV setting you can progrom the height of your RV into it.