After 12 years of RV'ing I've finally upgraded my RV to a '02 Journey with a 330 HP Cat. Also just bought a 2001 Saturn LS1 as a towed. I'm in Portland, Oregon and a local trailer business is an autho...
Another option if you have room is to add another dedicated bulb to the taillight housing that is dedicated just for being a toad. I have done this to jeeps and one Saturn. Just drill a hole in the housing to accept the bulb and run wires underneath to the front, plug into the MH and away we go. No diodes, no cutting factory wire, nice and easy.