I use the copilot GPS app on my phone & tablet. On the tablet it gives me a nice 9" screen for which I don't need my reading glasses. I paid 9.99 but it is now 14.99 I think. It has an option for RV with a max 13.5 ft height. Been using it for 3 years or so and I am happy with it. You can use it with or without a data connection but if you want live traffic then you need the connection. No matter what brand of gps I have owned I always make sure I know my route ahead of time. I also use the Rand McNally Trucker Atlas and The Next Exit books to help plan the trip. Any GPS will potentially get you into trouble sooner or later especially if your in a big rig.