Why you want an RV specific GPS is because you enter the length, width, height, and GVWR. Then the GPS won't take you thru a tunnel that will take your roof off or a bridge that can't handle the weight. They also have the repair shops and rest areas around you. I also recommend the Garmin RV770.
Added: HWH Kick-Down Leveler; RoadMaster Anti-sway bars; Tornado Rotary Tank Rinser; Accede Backup Sensor Kit; cylinder locks (w/one combo lock); custom sink cover; Kenwood DDX 5706S front radio; Pioneer MVH-X5560BT rear radio; Oxygenics Shower head; ScanGuage II; Blue Ox Tow Bar w/RVi Brake 2; Winegard Rayzar Automatic TV antenna; Trimark Steel door lock; Dometic 310 toilet; whatever is next.