This application pertains to {HEAD ~ a trailer} fairing for improving {TAIL ~ fuel economy} in long distance haulage of trailers 
This application pertains to { HEAD ~ a trailer } fairing for improving { TAIL ~ fuel economy } in long distance haulage of trailers
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH