{HEAD ~ The rear pair} of {TAIL ~ wheels} are coupled to the front pair of wheels through a drive assembly 
of
{ HEAD ~ The rear pair } of { TAIL ~ wheels } are coupled to the front pair of wheels through a drive assembly
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH