Behind our 2016 Tiffin QBH, we tow a 2017 Toyota iM, w/standard transmission, with an "Air Force One" supplemental braking system, and a Brake-away switch. I installed the toad side of the system, and an RV service facility installed the coach side of the system. I would've installed the coach side if I had the room under the RV to work comfortably. This is a proportional braking system, and is operated by coach brake air pressure. Way more than happy with it.