I have a Garmin Dezl, I think a 550 or at least an earlier version. Also have the OBD II connection for all the engine data while towing. So use this for engine data and one of the latest Garmin thin GPS for navigation.
A problem in setting an RV in the Dezl is that it tends to route in a way that the trip is longer . And is constantly stating it has no information regarding a road.
However, the engine data, fuel mileage, trip info is very useful. As I tow up to 700 miles in a day (14 hours) I like lots of things to keep me awake. And looking at mass air flow, other engine data can help to drive more efficiently or so I think....LOL
Ms Tommie Lauer
2015 Serenity 30 RB / 2008 Dodge Cummins 4 X 4
WBCCI #4165 AIR #31871
Happy trails and Good Luck
Ms Tommie Fantine Lauer, Greensboro, NC
AIR #31871 WBCCI #4165 K4MTL