The Hellwig EZ-990 Medium Duty Helper Spring kit is great for medium duty loads. Simply mounts under the factory axle U-Bolt plates to help restore sagging springs and stabilize your vehicle. These helpers come as a pair and have a million mile warranty.
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I purchased the 200 lb helper springs EZ990 for my 2012 Toyota Tundra. They installed extremely easy and the job was complete within and hour. I pull a 30 camper trailer and for this reason I purchased the springs, they work extremely well and afford more control over the load while towing. I found no problem with the installation and find the EX9900 helper springs are an excellent value.
These worked perfectly. Easy to install. Works very well to keep level load for several hundreds of pounds in the bed. I carried 5-600 lbs around daily and always got flashed at night because it pulled the bed down so I was hitting people with my low beams. These helper springs took care of that. If you want to regularly carry more than 1000 lbs get the next step up in helper springs. I will buy again for my next truck. Also, I bought these for my old excursion to level it out too. Great product.