^ The doc states that is is run by 'screw actuators'. These might be hydraulic or pneumatic but I suspect the former. While out of my league reading a patent such as that, further investigation on the terms used suggest it is possible that the actuators may create the vibration as well. They are rugged little puppies. Conclusion, the ride vehicles are basically built like a swivel backhoe with all of the hydraulics for the backhoe itself located underneath the swivel. It is heavy Industrial machinery.