The stand has {TAIL ~ a planar base} mounted on surface engaging members such as {HEAD ~ steerable casters} 
The stand has { TAIL ~ a planar base } mounted on surface engaging members such as { HEAD ~ steerable casters }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD