Charge Batteries by Idling Tow Vehicle?
This may be a dumb question, but since every tow vehicle has a generator which is connected to the batteries and they charge while driving, how about hooking up and charging at the campsite while idli...
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The factory wiring to a 7 pin connector is designed for maintaining a charge on the trailer batteries, not for a full recharge. Voltage drop over that long of a run with any significant load will be significant.
