I had the Firestones and incab controls and loved them. I think both the Firsestones and the Air Lifts do a good job. The Timbrens are also good but the reason I'd go with the airbags if I need them in the future is the easy adjustment with the incab controls. It's easy to adjust them for towing and back again for solo driving. And for fine tuning the ride on some of those difficult roads, both towing and solo. I'm not sure whether the Timbrens are adjustable?
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