A forward extension of {HEAD ~ the front U shaped member} can be connected to {TAIL ~ a bicycle} so the trailer can be towed 
A forward extension of { HEAD ~ the front U shaped member } can be connected to { TAIL ~ a bicycle } so the trailer can be towed
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH