I just had two extra leafs put on my Nissan Titan half ton. My buddy just put the air lift, air bags on his F-150 but he had some problems with them leaking but every one else I know who has used them never had problems with them. If I was using a gooseneck then I would use the air bags because leveling is real important for tire, axle, and front end wear. But I just pull a pull behind and want my hind end to stay up and also I want the truck to be able to handle 50 bales of hay and pull some of my hay equipment. The air bags I did not want to mess with the extra hassel of re-filling and letting air out to keep the truck level and wireing up a compressor on board would have cost a lot more then an extra leaf. Plus I have a couple extra heavier pick-ups, just picking up an extra half ton is so much cheaper then buying a 3/4 ton.