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