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