A point of understanding...
I did not put air bags on my F-150. The Timbrens I refer to are big rubber helper springs that just bolt on the frame in place of the rubber axle bumper stop thing. They float about 1.5" above the axle when unloaded and contact the axle when loaded.
No moving parts, nothing to adjust or leak or tear up when the truck is on the service rack as is the case with some, not all, airbags.
Some people don't like the way Timbrens ride when loaded.
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