An exemplary system for use in a package delivery vehicle is provided that may include a hinge member that includes a first opening and a hinge body that includes a second opening that is pivotally coupled to the first opening so that the hinge body can pivot with respect to the hinge member. The hinge body also includes a first protrusion and a second protrusion that extends from the first protrusion. The first and second protrusions are slideable within a key structure that extends at least partway along a longitudinal axis of an edge railing of the package delivery vehicle.