My experience tells me to leave your unit unplugged so you don't overcharge your house batteries. I was leaving mine plugged in and ruined by house batteries. Now I just plug in a few days before a trip and start the refrigerator before packing up to leave.
2005 Sun Voyager, Safe-T-Steer
2009 Chevrolet Malibu, Blue Ox, SMI Duo,
Ohio Cardinal Gulfstreamers
FMCA Gulfstreamers International