Probably not much. Motion sickness is mostly caused by your brain trying to resolve opposing signals between your eyes and your sense of motion. If you're look

Probably not much. Motion sickness is mostly caused by your brain trying to resolve opposing signals between your eyes and your sense of motion. If you're looking at a non-moving scene like a screen in the car, but everything else in your body says you're moving at 60 MPH, you might get motion sickness. A gimbal-mounted seat would change how often you bumped around, but your vestibular system would still sense things like going up/down a hill or making a turn. Basically, a gimbal-mounted seat would be about as effective as a perfectly paved road.