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Famtwo, we had that same problem of the bumping on the freeways when we first got our rig. One solution was to add the MorRyde pin box, others have Fifth Airborn and some others. The bumping you feel is the expansion joints in the concrete. Rig is actually going up and down and it is transferred to the truck by what is called "chucking". After we added the new pin box it relieved about 70% of this. We later added a Trailersaver Air ride hitch to the truck, the unit seems to float down the freeways now. Keep in mind we are fulltimers and the added costs of all this must be weighed with how often you pull.
When we had our 2500 we added air bags to keep from "bottoming out" (which we never did). We also added an extra leaf spring to the 2500, made for a stiff ride without towing but helped overall while towing.
This was MY solution only, we later traded for a 3500 dually, which, I feel, is more suited for the 3400. Keep in mind this is my opinion only and you will receive others as well.
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