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