No, tanks are fine, especially when driving uphill. You won't get a min30ton tank(T55) to go up a 50* slope at 20kmph. It is simply impossible. I think that the current 7-13kmph is too fast too. I mean if they would go that fast, their gearboxes would break after a couple hours of use.
As for everything else, I did not ask for the VBS2 to be made into ARMA2. Just some basics, like normal physics, armor penetration and damage.