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Rickfox, I'm not sure which ones you got but my Firestone airbags both air up at the same time, to the same pressure. I think there's an option for separate controls, so maybe that's what you got. Mine has the onboard compressor so I air them up and dump the air with a switch in the cab. Maybe that's the difference.
In any case, this is the second truck we've had Firestone airbags on and I'm sure sold on them. With the onboard compressor I can also adjust the ride on the fly when we hit those concrete expansion strips. I like being able to adjust for conditions.
I've never tried the Timbrens or anything else so can't comment on them.
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