Deny the field ack, town ack, facility ack, etc to fire on GV's. Instead, create a new object, say anti-tank installations on the edge of towns and on the borders of fields.
Small 37mm German Anti-tank would be nice.

Pak38 50mm Anti-tank gun

Pak40 75mm Anti-tank gun

Perhaps they'd get out of control if they were AI controlled. Maybe make them mannable installations from the hangar?
I'd like some feedback/input. How would you feel about this alteration?
thanks