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