Further features provide adjustable positioning of the wheels and the casters for {HEAD ~ a selective preferred balance} of {TAIL ~ maneuverability} and stability 
of
Further features provide adjustable positioning of the wheels and the casters for { HEAD ~ a selective preferred balance } of { TAIL ~ maneuverability } and stability
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL OTH OTH