The Garmin RV-760 lets you put in specs for your RV but does not have let you put in to avoid propane restricted routes, bridges, or tunnels (if this is important to you), The Rand Mcn RV GPS does. The Garmin Dezl does in truck mode but not RV mode - but truck mode will route the RV just was well. The Garmin has traffic routing, the Rand McN does not. I bought the Rand McN before the Garmin RV came out and before I knew about the Dezl -I set it to avoid height clearances of less than 12 feet and it routed me onto a road that had a 7' 10" restriction. The Rand McN went back the next day. For now I am using the CoPilot GPS app until I see a GPS unit that will do it all for an RV (which CoPilot does).
