{TAIL ~ means} for detachably mounting said hopper box across {HEAD ~ the rear} of a sand/salt hopper truck 
{ TAIL ~ means } for detachably mounting said hopper box across { HEAD ~ the rear } of a sand / salt hopper truck
TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH