So a while back I went down the rabbit hole with regards to supplemental braking systems.
Looking at various options, they all seemed similar, and I thought I had it sorted.
Until I realized that essentially none of them were progressive. Instead, ON-OFF, with calibration for max braking effort,
triggered by either surge or brake lamp (electrical) signal, or both.
The ONLY one I could find that is truly progressive is the one I went with. The Brakemaster 9060 by roadmaster.
In short.... the system integrates into the hydraulic brake system (or air if air braked) of the tow vehicle, and via an air compressor applies progressive braking to the TOAD.
Slowly apply the brakes on the truck, TOAD does the same, hard brake application on the truck, TOAD does the same.
All is based up brake line pressure on the truck.
So today I installed the hardware needed in the tracker. This includes a breakaway assembly using a are chamber and breakaway switch.
Air cylinder that mounts in the cab attaches right to the brake pedal. I also fabricated a simple assembly for the seat side attachment.