I use a 9300 Brake Pro with success. "TAZ" on here has a mod for it that I will install when I get home. It only allows braking when the MH brake lights are on.
04 Horizon QD, 12 Ford Flex, Excalibar, Brake-Pro, ,, Winter Texan, RVin! since 1974
Norm, Donna & Tinker Kat 74 MGB-GT, 75 MGB, 01 Z3
Life is a Timed Event, you only get One Go Around!