The most common form of German tank in WW2, the Panzer IV series was the workhorse of the German tank corps. It is the only German tank to have been produced from the onset of the war to its end, and served as the base from which other German armored vehicles were created, such as tank destroyers and anti-aircraft mobile artillery. The Ausf. J variant had the greatest range of the series (up to 310 kms between refuelings), as it featured an extra fuel tank.