How? Its main target would almost certianly be structures. If you're trying to use this as a GV-buster you're an idiot.
Targets in list of priority:
1) town (its a 150mm heavy gun for christs sake. A battery of these things will flatten a town in minutes, with no travel time).
2) airfield structures. Knock down the hangers, knock down the ord.
3) CV's..... hehehehehehe, screw you noe horders.
4) field guns
5) resupply convoys
6) random trees...... 'effing trees

.
7) tanks
OK, maybe not the trees and convoys, but still, out of the main (to say nothing of obvious) targets, GV's will still be on the bottom.