The deck element further includes {HEAD ~ a walkway} along which an operator can walk to enter or exit {TAIL ~ the trailer} 
The deck element further includes { HEAD ~ a walkway } along which an operator can walk to enter or exit { TAIL ~ the trailer }
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL