I have the old Garmin Nuvi 465LMT, which was a commercial truck GPS and is now discontinued. It did come with lifetime map updates though and it's still pulling updated road hazard information so I would imagine any of the new RV specific units work the same.
I won't travel without it given the height, combined length, and weight of the 365SAQ.
2013 Forest River Sierra 365SAQ, 7000# Axle Swap, 5th Airborne Air Ride
2010 Chevy 2500HD D/A, CC, Timbrens, Curt Q16 Slider
Nights Camped in 2015 -- 40
Nights Camped in 2016 -- 26