Timbren SES Rear Suspension Enhancement Helper System for 88-99 C1500 C2500. Unstable loads while towing and hauling don’t just make for an uncomfortable ride. Whether you’re towing your RV across the country or hauling hay down the highway, the Timbren SES kits level your load, making for a safe, controlled ride so smooth, you might forget you’re towing altogether. The Aeon® rubber springs deliver a progressive spring rate. As load increases, our rubber springs push back harder, eliminating squat, sway, and roll. After installation, there should be a ½” to 1 ½” gap between the rubber spring and vehicle’s frame – meaning you’ll enjoy a comfortable unloaded ride, too. 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 sag, sway, and roll when towing and hauling. Comfortable ride, loaded or unloaded. Rated Capacity: 3,000 lbs. 2 x Mounting Brackets. 2 x Patented Aeon® SES suspensions (hollow rubber springs).