Prepare your semi truck to be Ready for the Road Ahead , with the Hendrickson 48" & 54" Box Quik-Draw Rear Linear Actuator that helps improve suspension. Due to its sophisticated design, this replacement piece is able to quickly respond to changes in a road surface, allowing for a smooth and seamless operation. Manufactured to withstand the rigors of heavy duty use. FleetPride is your First Click in Heavy Duty .