Is not part of the reason for the bumpy ride the short wheelbase? I've noticed in certain big empty parking lots, that must subtly dip and rise as I cut across, my VX gets rocking so bad I think I have a flat or something.

Some roads around here are like that too (not as bad though). When I'm on a road like that and reach up to adjust my radio volume I often accidentally turn it off (it just takes a slight push on the volume knob of course) because the "rocking horse effect" as a previous poster called it, causes my fingers to plunge into the volume knob