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