America is known for making big cars and the 60s and 70s saw some of the biggest. But which one of these behemoths is the best? To find out, the Top Gear guys select their favorite and compete in a series of challenges as they travel along the Mississippi. The winner gets to drive the new Corvette Stingray.

Is it possible to make a vehicle that's as good on water as it is on land? Rut, Adam and Tanner build their own amphibious vehicle and put them through a series of road tests before embarking on a huge water challenge, attempting to cross one of the Great Lakes.