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Low air suspension refers to the fifth wheel height from the ground. The suspension system (low air leaf) is a suspension system with a lower ride height and is used by many transportation companies because it allows their truck to hook up to a variety of trailers. In modern days, low air leaf has been replaced with Flex Air suspension (low air leaf is still available). Flex air has the same ride height but weighs several hundred pounds less, thus allowing the truck to haul more weight in the trailer.

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