Abstract: This invention relates to a retractable cover system and, in particular, to such a cover system for use on truck load bodies. Retractable cover systems are known, the most simple being tent-like structures in which a fabric cover is loosely located over a framework. More complicated systems are also known in which substantially rigid cover shells are provided which are then hinged for movement between the open and closed positions. This invention provides a cover system which combines the simplicity of tent-like structures with the ease of use of the more complicated systems described above.