You need to build a heavy steel bed. Most of the HDT haulers do that and don't complain of a bouncy ride. There's really nothing you can do about the air ride. Those automatically adjust the ride height so no way to let air off without screwing up the ride height. Do you have new shocks on it? From the research I've done the shocks don't last very long on these rigs.
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'03 Freightliner FL112, 295" wheel base, with '03 United Specialties 26' living quarters, single screw, Cat C12 430 h/p 1650 torque, Eaton 10speed , 3.42 rear axle ratio
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