An interesting proposal. It did fix up weapon team wipes.
I'd guess it might still be too easy after that, though. Just needs anything that shoots something which explodes to bring down the Flak HQ easily after the AS then - which is quite a large target and many things which shoot stuff that explodes need not have to see the Flak HQ to hit it.
And, of course, the other trucks mostly can just suck it since they can't defend themselves.
If making the enemy spend 325 munitions on your hq that costs a bit of mp and fuel isn't a good deal then I don't know what is.
Inb4 it takes out multiple at once, so does a stuka bomb on my squads in my base. The counterplay is to not clump your hqs so close. Like seriously the guy just spent 325 muni on your hq that has existed for like 20 minutes and gave you a local advantage, what's the problem?
You should be happy he didn't pick the croc commander