Firestone 2535  Ride Rite Air Helper Spring For 2011 -2012 Ford F-250 (Diesel 4x2 & 4x4), F-350 (Diesel 4x2 & 4x4), F-450 (4x2 & 4x4) 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