IMO that hardly matters.
Most tracked vehicles are produced in purpose built facilities such as the Detroit Tank Arsenal. Construction of tank factories in 1930s Germany had to compete with construction of border defenses, coast defenses, factories for the production of ammunition, small arms, artillery, aircraft, aircraft engines, army field gear, hydrogenation plants to produce fuel, synthetic rubber plants, synthetic textile plants etc. Building border defenses and a military-industrial complex from scratch isn't easy, quick or cheap.