Abstract: A truck bed extension apparatus can include a hinge assembly having a hinge plate configured to be coupled to a primary tailgate of a pickup. An auxiliary tailgate includes a lower edge pivotally coupled to a front edge of the hinge plate, the auxiliary tailgate being pivotally movable between a stowed configuration co-planar with and adjacent to the hinge plate and a deployed configuration extending upwardly from the hinge plate. A pair of side panels is pivotally coupled to opposed side edges of the auxiliary tailgate and selectively movable between retracted and extended configurations. The hinge assembly can include a limiter configured to limit movement of the hinge assembly to prevent sagging of the auxiliary tailgate when in a stowed configuration.