DKS 9240 Max Security Slide Gate The Doorking 9240 Series operators feature a 10 Ga. Heavy-duty steel cabinet and are designed to operate vehicular sliding gates weighing up to 8000 Lbs. These operators have a variable speed drive with slow-start / slow-stop circuitry. The mounting pedestal is included. A chain support tray is recommended for gates exceeding 20 feet in length.