As marcush said, it's a matter of money.
Bernie could probably afford to build this parallel delta type of robot big enough to carry mock-up chassis with driver inside:
[youtube]http://www.youtube.com/watch?v=8G59zTXV ... detailpage[/youtube]
Accelearation +30g, max speed +25m/s. Bumps and yaw no problem.
Obviously to sustain acceleration for +6s one need seriously long arms
Or one can use this type:
[youtube]http://www.youtube.com/watch?v=BJ2UHvZb ... detailpage[/youtube]
All you need then is +1km linear gantry