A retractable cover system for a tipper trailer body of a truck includes a cover for the top of the trailer body , and a winder pulley for controlling the movement of the cover across {HEAD ~ the top} of {TAIL ~ the trailer body}  
A retractable cover system for a tipper trailer body of a truck includes a cover for the top of the trailer body , and a winder pulley for controlling the movement of the cover across { HEAD ~ the top } of { TAIL ~ the trailer body }
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