Historically German tank and plane production was highest in 1944. Without Western Allies bombing campaign they would have produced more and also would have had fuel to fight and fly. The Soviet Union was very dependent on the Western lend-lease: the Soviet tanks needed fuel and most fuel trucks were lend-lease. The same with motorized infantry, most vehicles were from the West. The Soviet (and now Russian) propaganda tells that the Soviets won the war nearly alone - they did not.
The US industry was stronger than the rest of the world - yes. The Soviet Union was very dependent of it.
Ï did not say "without allied supplies", I have said "without D-Day", and that is not the same... I agree that SU needed allied supplies of food cans, fuel, electronics, rubber, shoes, trucks, supposedly even something for ammo production.
Also I have said that UK, US and SU have outpaced Germany in tanks production, but I didnt say that German production was not increasing, it was, hugelly in 44.
But, when you are mentioning that, and that Germany would have enough fuel for it, there is a catch. Germany on purpose didnt motorize its army, because they would not be able to afford it, both the trucks production as well as the fuel consumption.
Second part of the problem is if Germany was having much more tanks. There is huge logistical chain of issues behind
- more imported Iron and other metals - Germany have no money for it
- impact on railroad network (during production), as they didnt have their production concentrated like US or SU
- need more trains and wagons for transport of the armored divisions
- need more high skilled engineers, as their tanks were not designed to be produced by lesser skilled labour, like in US or SU
- not enough drivers
- tanks need much more crew training than other military branches, germany couldnt afford that easily in 44
- each deployed tank need 5-10 other deployed "frontline" vehicles in the division - motorized inf, SPG, recon, ammo vehicles
- each of these vehicles (tank and the MotInf) need its supply vehicles, repair squads, supply hubs, undercarriages, bergpanzers, bridging and engineering squads etc
So, from military supplies PoV, for each tank you need 20 other vehicles running, and lot of people taking care of all the production, logisticst and maintenance... I do not think Germany was able to provide that in 44, but it is only y opinion.