Abstract: A cover system, for protectively covering a trailer, includes a plurality of stakes, stake-supported panels and stake-retaining pockets. Each pocket includes a base section, adapted to be fixed to the vehicle, and a movable section which moves between open and closed positions of the pocket. The stake-retaining pocket is formed when the movable section is in the closed position. Each stake includes an inner section, and an outer section selectively connectable to the inner section to define a pair of panel-receiving recesses therebetween. The inner stake section is thicker than the outer section, and the outer section includes an intermediate portion for separating the panel-receiving recesses when the stake sections are connected together. Rails may be used above the stakes to hold the panels in place, and a plurality of bows may adjustably or non-adjustably support a tarp above the rails. A trailer incorporating the cover system is also described.