Yesterday, I measured my lowest point of clearance with the 37" tires, which was the front skid plate. Without the airbag engaged, I had 11.25" of clearance. However, with the suspension engaged, I had ... 11.25" of clearance. Hummer obviously f'd up by saying that activating the rear air supsension increases the approach angle. Logically, it could do nothing but decrease it - marginally, of course. The air suspension does increase the breakover angle, which is its main benefit IMO.
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