The drivetrain 22 may selectively couple to {HEAD ~ any number} of {TAIL ~ driven wheels} in a manner known in the art 
of
The drivetrain 22 may selectively couple to { HEAD ~ any number } of { TAIL ~ driven wheels } in a manner known in the art
OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH