I have Kelderman's 4 link rear and 2 bag front system with height sensors on all four corners and the Accuride computer to monitor ride height. I just finished install a week ago and am still fine tuning the ride. So far I'm pleased with the system. Ride has improved and I do like keeping the pickup level regardless of load. The air compressor is fairly quiet but you can easily hear air exhaust out of the bags, not a big deal, but its not like a semi tractor where its virtually silent. I did the install myself and took a fair bit of time to install the bags on both front and rear axles. The Kelderman kit does seem to be well designed and it uses quality materials and craftsmanship. I was a little concerned about blowing an air line, as that would disable the pickup, so I put wire loom over the air lines and will have to watch them so they don't rub against anything. Once you get everything set up, reliability shouldn't be a problem. Blown air bags on OTR trucks aren't a big problem area, so I'm not too worried about that, and Kelderman's bags seem plenty big for a pickup suspension. I have called Kelderman's a couple of times for tips/advice and have always been able to get my questions answered quickly. My pickup is pretty heavy, which is why I did both the front and rear. If your just looking for some help on the back axle while towing, I'd look at their two bag rear system.