Help, Ford Explore battery dies when flat towing

Sounds like you got it licked.,
Some forget to turn off the headlights, or close the ac outside vent,etc.
Our 10 Edge we didn't turn the key all the way back and ran the battery down.
We have a charge wire from the coach. The brake lights, turn indicators and at night the taillights still require electricity. So far with the 13 Edge we haven't run the battery down. Still stop every several hours and start the Edge and run it through the gears.