Just recently purchased a Garmin RV 760. Prior to that, had been using a 2006 Garmin (car model) with non updated maps. Have been playing with the 760 and so far it has been great. Have not, however, been on any long trips with it yet. The voice command feature is pretty darn cool.
I usually program the route in and hit the road. My wife will have her phone programmed as well and will supplement the GPS should we need it.
Have not experimented with auto vs rv mode yet but will.
I LOVE the big screen. If you watch ebay, you will find a factory refurbished model with a full warranty. That's what I did. $279 give or take, IIRC.