I have used a U.S. Gear system for the past 13 years or so. Its permanently installed in both the MH and the toad, just plug in the umbilical from the MH to the toad and its activated. All proportional braking, and braking pressure is adjustable from the MH dash. It was fairly expensive 13 years ago, probably more today. I had the system transferred from my former DP to the Gemini when we bought it.
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