There should be no reason that a diode based wiring would not work. Roadmasterinc.com has wiring directions under the support area. A simple plug type wiring may not work It takes cutting the Edge's wiring and installing diode to prevent feed back into the computer.
One option would be magnetic lights. I installed a four conductor wire under previous toad. Left a female trailer connector on rear of vehicle. Then plugged in the magnetic lights to it. This was on SUV. I left the new wire in the back of it and ran magnetic light wiring through the rear door.
Another newer method is wireless lights. Have not seen too many in use.
