Fluid power mechanisms are disposed on the support structure for moving {TAIL ~ the support structure} upwardly and downwardly relative to {HEAD ~ the ground} 
Fluid power mechanisms are disposed on the support structure for moving { TAIL ~ the support structure } upwardly and downwardly relative to { HEAD ~ the ground }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD