Abstract: A covering assembly adapted for use over a bed of a vehicle comprises a cover having sleeve structures extending longitudinally along opposite lateral edges of the cover and on opposite side walls of the vehicle, a pair of tension rod members and a plurality of tie-down devices. Each sleeve structure receives one tension rod member and the plurality of tie-down devices interconnects the tension rod members to the pickup truck so that the cover can maintain a taut condition over the bed of the vehicle. The covering assembly also includes a frame assembly and a plurality of insert adapters. The insert adapters are mounted into pre-existing stake pockets of the vehicle and the frame assembly is supported by the mounted insert adapters. A substitute cover is adapted to be positioned over the frame assembly to form a tent structure over the bed of the vehicle.