We just towed our Jeep Cherokee, from Idaho to Georgia, with the Brakemaster.. worked perfect!
For an air-brake coach, there's nothing better for simplicity. (I bought mine off eBay, for $100+, vs. the $5-600 new price)
If you plan to keep the toad for a long time, I like the one that mounts an air-cylinder between the vacuum-booster and the master-cylinder, on the toad. Takes a little extra work, but it's a one-time job, and you have nothing in the cab that has to be removed before driving the toad. (Sorry, I can't remember the name of this unit - maybe someone else can tell us)
1998 32' Allegro Bus
Future Alpine owner