I tow an F-250 that is 10,000 and first used the top line BrakeBuddy and did not like it. It only brakes in hard brake situations. If you want it, I will sell it to you at 50% retail (used for 4 months). I switched to the M&G system that cost me the same as the BrakeBuddy. However, it brakes in cycle with the coach 100% of the time and is no hassle (no box).
I would recommend it highly!
M&G