[RMcNeal]

I was considering Air Lift bags on my truck, but not because of sagging. I only had a problem with the "porpoising" effect on rough roads, especially bridges and over passes, or any stretch of I-95 in South Carolina south of I-26.
I ended up going with Timbrens and I'm very glad I did. It takes care of that problem and I don't have any maintenance. Air bags can leak, air lines can leak. They eventually require maintenance. Also the Timbrens were less than half the price of Air Lift, even without the compressor.
Installation only took about 20 minutes, too.