Firestone W21-760-2299 Ride-Rite Air Helper Spring Ride-Rite and Sport-Rite Air Helper Springs utilize a pair of convoluted or tapered-style air springs These air springs are capable of 3000 - 5000 pounds of load carrying Under no circumstances do we recommend exceeding the manufacturer's Gross Vehicle Weight Rating (GVWR) Ride-Rite & Sport-Rite Air Helper Springs can be installed on most light trucks, RVs and vans, Ride-Rite and Sport-Rite Air Helper Springs are installed between the frame of the suspension providing load support through the use of air pressure