Here is a fun vehicle that works well on land and vehicle. It can reach speeds of 45 mph on both and transitions between them fast. Quadski’s wheels can be deployed with the press of a button. Thanks to the GIBBS patented technology, you can reach higher speeds on water on this vehicle.
The Quadski has a 4 cylinder 1300cc engine. It has 4 wheel disk brakes and can handle weight up to 260 lbs. Not cheap but one fun vehicle.