For years I ran air shocks on my F-150, and they worked great. They finally, (after about 15 years), started to leak, and not hold air. They were Rancho's. I bought a new set, but afterward I didn't feel like crawling around underneath the vehicle replacing air lines, so instead I just went and installed a set of regular heavy duty rear shocks. The air shocks are still in the box, waiting installation.
When we moved, I wish I would have taken the time to install them. Because I made a couple of trips with a 12' U-Haul box trailer, loaded up with a lot of tongue weight. Which caused the back end to squat down quite a bit. The truck drove OK, but I miss not having air shocks. When these shocks start to go, I'm putting the air shocks on.