Towed our 2012 Explorer 15,000 miles this summer using a blue ox tow system with Air Force 1 braking system. The explorer batt maintains a charge through the pin connection from the coach. We did have a problem in Alaska with a dead batt, found a blown in-line 20 amp fuse installed between the coach and the explorer batt. Started making all electrical connections with the coach not running, never had another problem. As for shift pattern, I started the explorer each morning for a few min, shifted R -N- D back to N and shut off ignition. Never experienced any problems, make sure your radio and a/c are turned off each day.
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