Taking out armor, do I have my bases covered?

[TheBigRedOne]

So no "opening the hatch and dropping a grenade"?

In short, no, probably for a lot of reasons.

The way SB is modeled doesn't get down to individuals, only squads, for one. Most tankers are going to keep their tanks bottled up if enemy infantry is within striking distance of the vehicle, like in an urban environment.

If there's mutually supporting infantry around, imagine trying to run across 40M of open terrain to try to drop a grenade into the tank. Chances are good that you're not gonna get there. Think of the scene in Saving Private Ryan where the infantry are climbing on the German tank, only to get hosed off by a heavy caliber weapon they didn't see. Not pretty.