Want to Flat tow my Jeep Cherokee TrailHawk

I don't know what a Hopkins wiring harness is. I use an Invisi Brake system that takes care of the brake lights and tail lights and of course the Morpar Flat Tow kit. The Morpar kit allows the electronic steering to operate which eliminates the death wobble. Yes you certainly need some way to keep the Jeep battery charged. Once again in my case the battery is charged via the Invisi Brake system as long as I remember to tow with the parking lights on. To avoid trouble when towing be sure to do a complete lock to lock wheel check when hooking up. A couple of times I've run through the hook up sequence only to find that the wheels were not free to steer. The entire hook up process in my situation is about 17 steps long a pain in the butt but at least it works. The last check is to have someone walk beside the tow car and watch to ensure that all 4 wheel turn freely and that the front wheels actually turn when cornering.