Just curious, since your running direct drive. Will the motor free spin when letting of the throttle? As if you are going down a hill or need to roll back down a steep bank quickly? Nice work on the build maybe ill catch you one day I am in northern ky.
Does the hose stay hard over a night of sitting? Is there any dark color in the degas bottle? If either of these I would say a hg. Last lbz I had same issue it was an hg. I could brake torque in 4x4 with no cap and push coolant out.
Re: just want my trailer brakes to work for once.
Ground to the trailer? Broken wires at the wheels? Brakes out of adjustment? Not wired correctly?. Does the controller show its hooked up on said trailer. "lights on controller"
Just a few places to start.
Have mine mounted on driver side with mount welded to axle tube. Never had a problem running 5.29's lockers cut 35-16-15 boggers Toyota axels dual cases on geo tracker.