Today we'll be reviewing part number HA81745. This is the Hayes Energize XPC Trailer Brake Controller for 1 to 3 axles. This brake controller activates your trailer brakes in proportion to your vehicle's braking action. What that means is that it's going to automatically adjust the trailer's brakes based on deceleration of the tow vehicle. It's going to activate immediately so there's no pausing… see more >