Max 's needed for max tank production speed.
Allied Jew tanks = 5 wars ... Single 75mm cannon, speed = 9 , strength = 300
Allied Medium tanks = 6 wars ... Single 90mm cannon, speed = 8, strength = 400
Soviet Heavy tanks = 7 wars ... Dual 105mm cannons, speed = 7, strength = 400
Soviet Mammoth tanks = 12 wars ... Dual 120mm cannons!, speed = 4, strength = 600