Use the controller to manually apply the trailer brakes to ensure it is the trailer that is the problem, and not the truck or the hitch.
06 c4500 lly monroe hauler body, preditor tuner,
air bags, air seats. 32ft chalenger 5th wheel 13k with trailersaver airhitch, fuel rail shim. airdog
raptor lift pump, egt guage. Equal tire balancing system.
Prodigy wireless brake controller. Iridium Sat phone, pcv reroute, boost guage.