{HEAD ~ Each pair} of ground wheels 16 is mounted to {TAIL ~ the rear end} of an arm 18 that is positioned between the legs of, and pivotally attached to, a main channel like arm 20 
is mounted to
{ HEAD ~ Each pair } of ground wheels 16 is mounted to { TAIL ~ the rear end } of an arm 18 that is positioned between the legs of , and pivotally attached to , a main channel like arm 20
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH