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Firestone and Helwig are the two brands I see most often in my readings. Helwig ads claim that they recently changed their design some to allow for better ride and longer life; haven't seen anything on the firestone branded items but I'd guess they are both close matches. Big difference in posts seem to be whether you go with an in-cab monitor with pump, or just have to fill / adjust bags manually using an outside pump.
Tembrins don't seem to have an impact on the ride until you load the vehicle and 'squash' down to their level; airbags on the other hand impace loaded and unloaded driving -- a lot of posts where owners have said they reduce pressure in their airbags to 5 to 15 psi...
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