[Double_Deuce]

In combat, I doubt the tank commander cares little for the infantryman clinging to the outside of his vehicle.

You can see passenger information by right clicking on any spotted vehicle or do you mean another way to show this information without having to right-click?

I generally use MG fire to strip them off although engaging the vehicle with any type of fire should work (some probably more than others). Direct fire probably works better than indirect fire though.