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Rick, do you have the onboard compressor and in-cab control for the airbags? We adjust the psi in the bags when we hit pavement like that and it does make a major difference. Doesn't eliminate it but it does help. We do this without slowing. If no compressor then the solutions others suggest might be in order.
It sounds like you can't lower the hitch any further nor the pinbox. Sometimes adjusting the height of the hitch will help (shifts weight off the truck) or the reverse may help. But you probably wouldn't want to raise the nose any higher.
We also find this probably is nearly always only on interstates. Rarely have we had this problem on US and state highways. It has happened but it's rare.
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