I have for years believed that the Firestone brackets were under engineered. It is just a poor design all around. I had one set that I attempted to install on an F350, no way it was going to work well, even hoping that no damage was done to anything. I called the tech support line and the guy that answered said that they had sold thousands of them and never recorded a complaint. Of course, he took no notes, no name, was not interested in the details at all. Proving that if you do not record any complaints, you can say on the next phone call, "we've never recorded a complaint".
Air suspension works extremely well, and all HD pickups really should have it. But the air bag band aids sold by Firestone and Air Lift are for the most part very poorly engineered. The bracketry is weak, and the design limits suspension travel to a fraction of what it is supposed to be.
