Air LiftLoadLifter 7500 XL Ultimate Air Spring Kit - Fits Chevrolet Silverado, GMC Sierra Models, See Fitment Details in Descriptions - 57575

Have a 2007 4WD K3500 that is used to haul shipping containers, which is needless to say, a substantial load. Due to the weight of the containers, along with the trailer, I found the helper springs on the truck were maxed out evidenced by the 'shiny spot' on the springs. Once the air bags were installed, there was an immediate difference noted in the suspension for both the handling and ride.With the AIR LIFT 72000 Wireless Air Leveling Compressor - [also installed ], I can stand back from the truck and trailer and get the load perfectly level. No more uneven squat to the rear of the truck when it is under load.As a side note, the installation took about 5 hours, with the truck on a lift. Instructions provided were pretty good, but be prepared to spend the extra time to find just the right spots for your compressor and valve assembly and be sure to keep the air lines as protected as possible.I usually run at about 5 - 10 psi when empty since the truck has a pretty stiff ride already, but now, even with the full load of containers, the truck and trailer sits dead level at 45 psi.Another benefit is the loading and unloading of the trailer - with or without the containers on the trailer. When I am ready to disconnect from the trailer, I simply inflate the bags to 100 psi and then crank the trailer landing gear down. After just a few turns, and the feet are under load, I again deflate the bags which allows the truck to lower itself off the ball. Definite time saver and saves wear and tear on the trailer landing gear - not to mention my arms too. With an estimated tongue weight on the gooseneck ball of >4000+ lbs, it really just works like a charm. Reverse the process when loading - center the gooseneck over the ball and inflate.If you are hauling heavy loads - even part time, this is a great addition to your truck.Net of this story - highly recommend this system [both AirBags and the wireless compressor system] for safety, stability and comfort.Thanks again to Air Lift. This is an incredible product that provides great value and is well priced.

I bought these because they were a lot less expensive than the Firestone version.Frankly, they do the same thing for a lot less cash. Installation was easy, but I added convoluted electrical harness conduit the entire length of the air lines to protect them from chafing and wearing a hole in them. They provide band ties, but I used about 10 more (from my stash) to get the air lines bundled up the way I wanted. You can purchase the conduit and band ties at your favorite local auto parts store or here on Amazon.My installation is with a single schrader valve that passes thru one of my rear license plate mounting holes, I didn't desire having to put air in twice and have no need to level the truck from side to side. This single schrader required purchasing a couple extra parts, a tee, and two quick connect couplers for the air lines.A word of advice here: Do NOT buy automotive quick connect couplers, they are $8+ and up, and are metal that WILL corrode and eventually cause you problems. Go to your local plumbing store and purchase the plastic ones made for 1/4" water lines with 1/8" pipe thread on the other end. The plastic versions go for about $2.50 each. They work great, are corrosion proof, and my system has not leaked down since the intallation.Okay, the air bags:They work great! They level out my truck when I have a load on it and that is exactly what I wanted them for. They ride smooth when I have a load and add air to the bags, and ride smooth when there is no load and reduce the air to the bags.Would I buy these again? You bet I would.There is no reason to pay more for these than you have to, and Amazon has them for less money than anyone else.

Recently bought a new 5th wheel with a heavier tongue weight. Emailed a tech at Air Lift to verify the correct kit # for my truck ('03 Silverado 2500HD LB). Response was within an hour. Kit arrived quickly from Amazon (best online price I could find). Relatively easy to install. My use is only periodic so I opted not to have an on-board compressor. I bring a small 100psi rated compressor with us when we go camping. Used a "T" fitting as side-to-side load is usually balanced. Ran the fill valve through a screw hole in the trailer power socket bracket next to the receiver hitch, leaving the bumper untouched.Unloaded with about 20 lbs. of air, it rides about normal. The truck is stiff with more than 30 lbs. in them. The system also reduces body roll when cornering.I used the 40lbs of support per pound of air recommendation in the manual and put 65lbs in the airbags to support the weight of the 5th wheel hitch and trailer tongue weight . Connected the 5th wheel camper and the truck was level with the full load on the hitch. Helper springs were no longer engaged. Towing was VERY smooth and stable.I would not recommend driving the truck empty with the bags pumped up more than 30lbs. Aside from being very stiff, it feels susceptible to wheel hop and reacts much more to bumps.I went with an air bag system because you can adjust the amount of support as you need it. The RV dealer recommended putting heavy duty springs on the truck, which would have also done the job, but the 98% of the time I drive the truck without the camper and little or no weight in the bed, it would be way too stiff and uncomfortable to drive. Air Lift gives the best of both worlds.UPDATE: I strongly recommend these only be used to occasionally boost the carrying capacity of the truck. Follow the specs and limits on your vehicle. They are there for a reason. Towing the 5th wheel on the highway or for long distances can get difficult, I encountered a longconcrete overpass on the highway that caused the trailer to "porpoise" or start bouncing up and down due to the slight dip in the middle of each section of concrete. Didn't lose control but it was scary. I've since purchased a bigger truck with more than adequate payload and towing capacity.