{HEAD ~ A collapsible trailer} to be towed by a bicycle has front and rear U shaped members pivotally mounted on an axle to {TAIL ~ the ends} of which wheels can be attached 
pivotally mounted to
{ HEAD ~ A collapsible trailer } to be towed by a bicycle has front and rear U shaped members pivotally mounted on an axle to { TAIL ~ the ends } of which wheels can be attached
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL REL OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH