I'm not sure if the crews of support vehicles have a side arm or a rifle but I think giving them a turret would be very good at protecting them. Say, a 50cal. I saw videos on youtube about support vehicles underfire and they have no way to counter it. Sure they have a humvee infront of them but still, a turrent mounted weapon on them would be useful, just in case.
What are your thoughts?

It would make many of them top heavy and inclined to roll over on a corner