Firestone air spring systems are designed to maximize safe load carrying capacity, stability, and overall ride quality. They are designed and assembled in the USA. Ride Rite air springs use the same Firestone technology used on many heavy duty trucks, trailers, and buses on the road today. Ride-Rite air helper springs utilize a pair of convoluted air springs, which can be adjusted for changing loads. These air springs are capable of 3,200 to 5,000 lbs. of load leveling capacity. Ride-Rite air helper springs enhance the ride by reducing inter-leaf friction. Please remember that air springs do not increase the load carrying capacity of your vehicle.