US tanks do a lot of damage but can't take a lot of punishment in return. As long as you keep your armour alive things will start to snowball and you can defeat any armour the Germans throw at you. Thanks to the resource scarcity of OKW you should be able to field far more tanks than the germans so long as you keep your armour alive.
The Stuart is also good for stunning other tanks so your Jackson can hit it. I've stunned and critted Elefants and Tigers from the front but I think the shot has to pen for the ability to work, so it's risky. I think Priest and Scott may also be able to Crew Shock if they hit, at least kill repairing pios.