The Tatra T815, known as "The War Rig" in the movie, is driven by Charlize Theron's character Imperator Furiosa.
The War Rig is a 78 foot long 18 wheeler based on a Tatra T815, an all-wheel drive truck from the Czech Republic. The truck's cab was moved from over the engine to the middle of the chassis and a custom front end was built from a widened 1947-48 Chevrolet Fleetmaster Sedan, complete with rear-hinged suicide doors. It also has a long, fuel tank and a fuel pod trailer hanging off the end. Welded to the hull are Volkswagen Beetle and Track cabin shells that are like mobile forts for the War Boys to hang onto.
Two of the War Rigs built were equipped with a stock, air-cooled V8, 275hp Tatra engine, however, it was under-powered so to adequately haul heavy tankers over rough terrain, the third War Rig was equipped with a 600hp Deutz engine used in Dakar racing.
Behind the scenes video of rolling The War Rig stunt