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Firestone Coil-Rite air springs, manufactured by Firestone Industrial Products, are pneumatic helper springs designed to fit inside the existing coil springs of vehicles such as pickup trucks, SUVs, and vans. Inflating them adds load support to help level the vehicle when towing or carrying heavy ca...
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Roadmaster Active Suspension springs are patented add-on leaf spring enhancement systems made by a U.S. company, designed to reduce axle wrap and improve stability under load for trucks and trailers.
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