As noted above, the 7 blade umbilical has multiple functions. Lights- running, brake, turn, reverse/aux. Brakes from the brake controller, and also a 12V power terminal along with a ground. You won't see any heavy duty charging of low SoC bank from the tow vehicle.
Generally if we start our journey with the battery bank topped off we should be able to offset the running of the refrigerator/inverter and arrive pretty well charged during travel.
Most would advise turning off everything else switchable, lights fans etc.
On departure I tend to stay plugged into shore power until right before pulling chocks. The hydraulic pump for slides and jacks can get the bank down from a float charge.
YMMV.
Happy trails.
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J&J
DRV Suites ES-38RSSA #9679
GM Denali 3500HD-Max 4x, CC, 8' DRW
EZGo-TXT, Yamaha-G22E, CC Precedent
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