A cover for a side-dump trailer or truck is disclosed wherein a rigid cover comprised of metal, fiberglass or plastic is movably mounted with respect to the side-dump trailer or truck so that the cover may be moved from a closed position over the upper end of the side-dump body or which may be pivotally moved to either side of the side-dump body so that the side-dump body may be pivotally moved to a dumping position opposite to that of the cover.
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