Hi Don, I have the Roadmaster Brakemaster system. I was lucky enough to already have it installed on my MH that i purchased used 4 yrs. ago but never realized it was there until I decided I wanted to tow last fall.
I also used the Roadmaster Universal Wiring kit with the 4 diodes. I ran the wires under the car, drivers side, right next to the frame rail and into the trunk, at the very back, there's 2 grommets with wires, I slit one of them and brought my wires in there.
The breakaway switch and the air connection I mounted in the lower grille close to where the tow brackets attach to the baseplate.
Send my your email address and I'll send you some pictures yours will be a little different but pretty darn close.
2008 National RV
2012 Jeep Wrangler