An endgate assembly connectable to a vehicle body for opening and closing a vehicle bed formed by the body includes an endgate supportable by the vehicle body at a pivot connection and openable and closable by pivoting about the pivot connection. A keyed support member is securable to the vehicle body. A damper and a cable are connected to the endgate. Both the damper and the cable have ends that are configured to be retained by the keyed support member when the endgate is pivoted between the open and closed position. The cable and damper ends can be removed from the keyed support member without tools when the cable end is rotated relative to the keyed support member. A method of modifying the vehicle bed by detaching or reattaching the endgate assembly is also provided.