Timbren SES Front Suspension Enhancement System for 07-15 Silverado Sierra 1500. Weight from a snowplow or heavy aftermarket accessories can cause dangerous front-end sag and sway. The Timbren SES front kits level out your front-end load, making for a safe, controlled ride. The Aeon® rubbers springs deliver a progressive spring rate. As load increases, our rubber springs push back harder, eliminating squat, sway, and roll to put you back in control of your vehicle. After installation, the rubber spring should be in contact with the front axle. What makes Timbren SES kits different from other suspension enhancement systems? Unlike air bags, these kits require zero post-installation maintenance. And unlike other systems, you can install and haul in under 30 minutes, right from your driveway. Reduces front-end sag and sway. Comfortable ride, loaded or unloaded. Rated Capacity: 14,000 lbs. 2 x Mounting Brackets 2 x Patented Aeon® SES suspensions (hollow rubber springs) All necessary hardware.