I run timbrens in all my trucks. Had them in my half tons too. I tried both air lift, and Firestone air bags. I hated that i needed to add air when loaded and take it out when not. They leaked air when it got cold, and had to take air out when lifting truck on lift. I just put timbrens in and forget about them. They just work. Air bags did help but more expensive and harder to deal with. In the picture it is 12,000lbs total. The truck sits nice. not sure why it cut picture off, maybe its the way i took it on cell phone. I also haul my tractor in my dump trailer