Actually, the 17000lb, 19000lb, 21000lb suspensions were all just about the same. On a 3 axle tractor you have 2-20000lb suspensions. Your air suspension doesn't really matter how heavy duty it is as long as it has enough capacity. If you need 17000lb and you get 23000lb suspension, because it is air suspension, it will ride the same as a dedicated 17000lb suspension.
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