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