The system comprises a closed loop controller, {HEAD ~ a towing arm assembly}, a load measuring device, an electric hub motor, brakes, a motor controller and a brake controller disposed on {TAIL ~ the trailer} 
The system comprises a closed loop controller , { HEAD ~ a towing arm assembly } , a load measuring device , an electric hub motor , brakes , a motor controller and a brake controller disposed on { TAIL ~ the trailer }
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL