{HEAD ~ A pulley system} is mounted on the tractor for connection with {TAIL ~ the flatbed unit} and fifth wheel coupler 
{ HEAD ~ A pulley system } is mounted on the tractor for connection with { TAIL ~ the flatbed unit } and fifth wheel coupler
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH