A vehicle having a front wall, two side walls, and a truck bed that altogether define a tonneau is provided. The vehicle includes a tailgate that has a front panel, a rear panel, two side panels, and a top panel that altogether define a cavity. The tailgate also has a tonneau cover deployable from and retractable to within the cavity. The tonneau cover is selectively movable between a stowed position, a deployed position, and a partially deployed position. In the stowed position, the tonneau cover is substantially within the cavity. In the deployed position, the tonneau cover substantially covers the tonneau of the vehicle. The partially deployed position is any position between the stowed position.