Heavy tank
The Char 2C was one of the largest tanks ever produced. At the start of World War II, France and the Soviet Union were the only countries to have inventories of heavy tanks, such as the Char B1, T-35, and KV-1. The Matilda II was designed under the British infantry tank concept which is similar to the heavy tank having thick armor and weighing more than their other tanks. It’s usually separate because they have less firepower with their cruiser tanks (comparable to mediums) at the time having the same main armament but more machine guns. Later war examples were the German Tiger I and II, as well as the Soviet IS series. Note that "heavy" versus "medium" is more a question of tactical roles than weight; the Panther, for example, was a "medium" tank that outweighed most Allied "heavy" tanks.
AH-IV
Sweden ordered forty-eight tankettes in 1937 as the "Stridsvagn m/37 (Strv m/37)" after a successful demonstration during winter conditions in the Krkonoše Mountains. They were to be assembled in Oskarshamn with a more powerful , water-cooled, six-cylinder, Volvo "FC-CKD" gasoline engine and armor, up to thick, from Avesta, although ČKD supplied most of the other components after building one prototype. The vehicle was heavily modified with the driver's machine gun deleted and proved to be the heaviest and largest version of the "AH-IV" at and a length of , a width of and high. Its turret mounted two Swedish "Ksp m/36 strv" machine guns and sported a small observation cupola on its top. It carried a radio and 3960 rounds for its machine guns. It had a maximum speed of and a range of . It could ford a stream up to in depth. The last components were shipped in November 1938.