I looked into this as originally I was going to have a Remco modification done on my Ford Taurus, and Remco dealers sell Roadmaster hitches and Brakemaster brakes.
However, since I got so many good references on the Brake Buddy, and my dealer(for my new motorhome) installs brake buddy and Blue Ox hitches, I went that route instead. I am having the Remco dealer ONLY install the axle lock modification on he Taurus.
Tom here on the forum can tell you about the M&G brake system, which I think is the best of all as it works off the air system of a diesel pusher. Only reason I did not get it is that Spartan requires a kit to be installed and threatens warranty will be violated if kit not installed. As far as I can determine, the kit is unnecessary and actually creates more chances for things to go wrong. I elected not to fuss with all this and went with Brake Buddy.
If you don't have a Spartan chassis, or if you do and are not worried about warranty complications, I think M&G is the best. Ask Tom about it.