First post I see.
There are several , radio signal controlled , towed vehicle brake systems out there, but they do rely on battery power from the towed vehicle , so depending on the length of time you tow and brake use you may require, a charge wire to avoid a dead battery on arrival.
The magnetic mount lights , require caution running the wires , over the toad, as movement of the wiring in the wind behind the coach can chafe the paint.