Hellwig Big Wig Rear Overload Assistance Springs stabilizes both the front and rear of your vehicle when hauling heavy loads. They consist of 2 air helper springs that mount on your vehicle's rear axle, provide 5,600 pounds of load support and give a leveling capacity to the rear. With a diameter of 3? that is larger than typical 2,500-pound air springs, they pack a larger volume of air that produces superior ride comfort and stability under heavy loads. They include a front sway bar that provides a high yield strength of 170,000 psi. Hellwig Big Wig Rear Overload Assistance Springs are specifically sized and tuned for your vehicle?s make and model suspension.?