If you are looking for a smoother ride for your vehicle that has a coil spring suspension, Firestone Coil-Rite air helper springs are what you need. Designed to fit inside existing coil springs to create a variable spring rate, Coil-Rite will level your vehicle and assist with more effective braking and handling, even under heavy loading and adverse road conditions. Coil-Rite air helper springs were also designed to work in temperatures between -40F (-40C) and 180F (82C)
Installed these on the rear of my FJ Cruiser. Took a few hours to install with my son helping. I tow a 3500lb trailer that would drop my rear end about 2" once the trailer and gear were loaded. These got the rear back up when towing and I keep a few pounds in them when not towing to stiffen the rear. I have towed about 1000 miles so far with no issues.
Firestone originally began over 80 years ago and its Ride Rite division manufactures air springs designed to enhance rides by reducing inter-leaf friction. Adjustable and capable of load leveling capacity ranging from 3,200 to 5,000 lbs., these springs exceed the rates of standard coil springs and are constructed of durable polyurethane. We carry Ride-Rite load leveling kits and leveling compressor kits for Jeeps that have a reputation for reliability, stability and unsurpassed quality. Designed and assembled in the U.S., Ride-Rite air helper springs will give you the help you need when you're carrying heavy loads. Shop Firestone Ride-Rite Now