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trucks have air suspension because it allows even weight distribution. The air can also be lowered allowing the chasis to drop a few inches making it easier to get underneath trailers that would not be high enough otherwise. It also makes for a much smoother ride than springs can offer because of the heavy loads trucks can carry massive stiff springs are required to safely support the weight. Air bag suspensions virtually eliminate the need for heavy springs, a relatively small amount of air pressure can support alot of weight.

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