Hello, this Heavy Duty Kit is like new. It was used on a 2024 GMC Sierra AT4 for less than 7000 miles. This kit will fit Chevrolet / Silverado too. The kit comes with brand new hardware (I had spare band new hardware on hand). Buy here and save. The kit cost $589.00 on RoadActive Suspension and on ETrailer.com websites. I am asking $425.00 cash. THIS IS THE HEAVY DUTY (HD) VERSION too. RAS part number is Kit ID: 4611-HD ETrailer.com part number is Part Number: RAS54FR You are responsible to make sure that these part number fit your truck and year. Get on Road Active Website and double check: https://activesuspension.com/pages/find-my-kit/ Check out the You Tube Video. https://www.youtube.com/watch?v=V4DdErj9bCg Due to spam - I have to state NO SHIPPING. This is a pick up item only in Sevierville, TN. I live off Pullen Road, close to Dollywood and Jayell Ranch. If you have any questions. Call me at eight six five - 279-0638. Benefits - Reduce Rear Squat & Bounce - Improve Stability - Improve Roadhandling & Stability - Make RVing Safer - Reduce Axle Wrap - No Readjustments or Maintenance Get the best of both worlds with this authentic RAS® Heavy Duty RoadActive Suspension kit -- the only solution that strengthens leaf springs by up to 50% while providing a more smooth, controlled ride at all times. Unlike other suspension upgrades that need constant adjustments & maintenance or negatively impact unloaded ride, RAS® eliminates squat, excessive bounce and body roll-- without hassle or sacrificing comfort . This 3-in-1 system offers the benefits of a helper spring, sway bar, and traction bar at the fraction of the cost of other upgrades. With a quick 1-hour installation and zero maintenance, it's the simplest most effective way to reduce squat and improve your truck's towing/hauling performance. Beware of cheap knockoffs -- choose the original, proven RAS®.