The armour vs weight issue taxes all the slow movers. HAVs do have a significant weight lifting advantage but it is difficult to see how they could armour it enough given the lack of ability to run, hide or manoeuvre. The company did honestly look one of our team (an Apache pilot) in the eye and said when they add armour his little bullets would just bounce off.
'You do know we are reasonably good at plinking main battle tanks don't you?'