Your big diesel truck is more than capable of towing big trailers and heavy loads, but you'll start to see some serious rear-end sag long before you hit your truck's GVWR or GCWR. Firestone's Ride Rite Air Springs can support even the heaviest loads from big trailers and huge cargo. Firestone has Duramax air spring kits, Cummins air spring kits, and Powerstroke air spring kits that can prevent rear sag even when your truck is pulling extremely heavy trailers, fifth wheels, campers, and toy haulers. Firestone's Ride Rite Air Springs are extremely easy to install and come with all their necessary hardware so that you're ready to go out of the box.