I think on the official forums they explained how to make tanks invulnerable. There is an option when modding tank armor to make it invulnerable.
I rather dislike this method, as this requires making a separate mod for each side. I'd be very happy if there was a way to make it so only the Player's tanks are invulnerable, not any tank of the same type.
As far as I know from the past games like,
Faces of War/Heroes of World War 2 and any others never have I seen a trainer to make the players tank Invulnerable.
But I have the tanks going fairly strong. Just the tracks are vulnerable but with infinite health infantry fixing them should be no problem.
Edit: I have a list of units now so now I can continue to edit the tanks. Also the tank treads are a global setting but I may experiment with them too.
[Edited by 1crash007, 6/18/2009 4:32:08 AM]