Trivially you can prevent rocking with many vehicle by eliminating the suspension. But is it possible to allow a floaty suspension that glides over potholes, without also having to rock back and forth, with some kind of stabilization? I know that it's possible in buildings, but having a fixed platform really helps.
I ask because the rocking motion is one of the primary sources of carsickness, and a bus trip this evening left me feeling rather queasy. This seems like something that could be improved, especially in such expensive vehicles.