{HEAD ~ the arrangement} of {TAIL ~ the plurality} of second rotatable means and endless linear means being such that the operation of the first rotatable means causes the simultaneous movement of the opposed side portions of the cover to retractably move the cover over the top of the trailer body 
of
{ HEAD ~ the arrangement } of { TAIL ~ the plurality } of second rotatable means and endless linear means being such that the operation of the first rotatable means causes the simultaneous movement of the opposed side portions of the cover to retractably move the cover over the top of the trailer body
HEAD HEAD HEAD HEAD HEAD HEAD REL 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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH