First, kudos for worrying about having an auxiliary brake on your toad. I could work out the physics for you, but suffice it to state that any towed vehicle becomes a ram-rod when you have to panic stop. If an accident occurs (God forbid), having a brake system may help you with your insurance company.
I chose U.S.Gear's unified brake system. It stops proportional to my coach, and has a separate controller so I can adjust the braking in my towed Jeep, as well as a way to "dynamite" the brakes in the Jeep. There is nothing to hook up apart from the electrical
7-->6 line from the coach to the Jeep, along with a breakaway line. Plug, Clip, I'm done.
The unit is permanently mounted in the Jeep, outta sight and outta the way.
Whatever works for you. Check them & price out.
07 TM 40D;ISL 450 Cummins(upgraded). Very happy w/coach
Gnarly toad to scoot around.
Geocaching, hiking, fishing, National Parks, Civil War sites.