Each turn assist {TAIL ~ cylinder} is coupled between the frame and {HEAD ~ a corresponding caster wheel assembly} 
Each turn assist { TAIL ~ cylinder } is coupled between the frame and { HEAD ~ a corresponding caster wheel assembly }
OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD