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