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