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