Airoll
Airoll is a system of vehicle propulsion that attempts to combine the strengths of air filled tires with those of caterpillar tracks to create an all-terrain amphibious vehicle while maintaining a reasonable speed and payload capacity. First conceived in the 18th century, the concept was still a novelty in the mid 20th century, which saw rapid development of the idea into practical vehicles by the United States, the Soviet Union, and multiple civilian enterprises.