The trailer can be tilted backwards until a back end of {TAIL ~ the trailer} contacts {HEAD ~ the ground} so that cargo can be easily loaded into the trailer 
The trailer can be tilted backwards until a back end of { TAIL ~ the trailer } contacts { HEAD ~ the ground } so that cargo can be easily loaded into the trailer
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH