The arrangement of the support pulleys and endless cable is such that by {HEAD ~ operation} of {TAIL ~ the winder pulley} , the cover is retractably moved over the top of the trailer body  
of
The arrangement of the support pulleys and endless cable is such that by { HEAD ~ operation } of { TAIL ~ the winder pulley } , the cover is retractably moved over the top of the trailer body
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH