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