Abstract: A tarping system for an open top dump trailer, comprising a tarp supported on cables extending along the tops of the side walls of the trailer. The front end of the tarp is affixed to the trailer body. The side edges of the tarp have attaching elements which slidably engage the cables. A transverse draw bar is secured to the free end portion of the tarp and has tubular end portions which slidably receive the cables. Wires secured to the draw bar extend along the margins of a terminal flap of the tarp at the free end and are connected to a line for pulling the tarp to an extended or retracted position.