Perhaps I wasn't clear enough.
With an example of a light truck system like this where there are light missiles/rockets on board I think that the addition of a gun would be a good idea. I think the .50 is the better solution as it isn't too heavy for the vehicle. A 30mm would be. IMHO one needs to pair a small rocket/gun vehicle with a vehicle robust enough to carry the 30mm. Effectively you have a team that has the necessary sensor/targeting system for CUAS and light aircraft work which can select from a .50, a 30mm or a rocket to engage as appropriate. When I mentioned the TAPV I wasn't sure whether it was robust enough (and maybe too tall) to be able to mount a 30mm and rocket pods as well and fire sideways off of it.
These would work well in rear areas. In forward areas I think a heavier chassied (and lowered hull) armoured vehicle based on a 30/35mm gun and rockets/missiles would probably be technically feasible and desireable.