If you are flat towing (which it's seems you are) you probably have at least a 7 into 4 hook up for your toad lights. All I did was run a wire from the hot pin in the 7 pin plug, thru a 20 amp one way circuit breaker to the hot post on the Edge. Took an hour, and cost 5 bucks. This has been for a year now, no problems since. Also, I run a solar/battery powered wireless stop/directional bar that suction cups to the rear window. Another way to stop any draw on the Edge battery.
Robbie
'11 Edge Limited AWD, pushing a 42' Fleetwood Providence MH