The improved design is relatively simple and economical, and operates in conjunction with {TAIL ~ the fluid power source} of {HEAD ~ its towing vehicle} 
The improved design is relatively simple and economical , and operates in conjunction with { TAIL ~ the fluid power source } of { HEAD ~ its towing vehicle }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD