760LMT here, updates easily, you can make adjustments to it easily. Easily usable in RV or toad/other vehicle - just switch modes.
We use in or RV and Jeep. Our previous car had built in GPS, the Jeep does not. It worked fine for both.
We use it quite a bit. Last summer we were on the road for a month+, from Texas to Canada/Niagara and back. Worked well with warnings, etc. However one problem I've noticed in multiple cities - with tall buildings is it goes a little nuts. You can tell it's having a hard time keeping signal. You automobile icon will jump around the screen until it relocates the signal. It did this in New York and it Dallas a couple of times...not a deal breaker.
2015 Georgetown Forest River 351DS MH
2008 Keystone Cougar 293SAB 5th Wheel
2007 Jay Flight 30.5RLS 5th Wheel
2006 Jay Flight 29BHS TT