The lowered position is for {TAIL ~ long distance haulage} of the trailer in {HEAD ~ order} to achieve fuel economy 
The lowered position is for { TAIL ~ long distance haulage } of the trailer in { HEAD ~ order } to achieve fuel economy
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH