Just put it on an AEC and have it follow your tanks. Designate Command Vehicle is one of the most powerful abilities in the game. An AEC with tread shot and two vetted Fireflies is easily the deadliest AT force in the game with incredible DPM.
Just an example (and this wasn't even a very long game):
The only thing that makes this ability balanced is that you have to sacrifice a unit for it (though the debuffs don't seem to apply to tread shot so that still works nicely) and that it costs a ton of resources to accumulate. But once you get things rolling...
Thanks for the suggestion! I tried it today but with a Comet and Cromwell on City 17. Tread breaker helped kill multiple tanks including a Panther, and after the Comet and Crom vetted the other team stopped trying to push them around with their PGren shrek blobs. Unfortunately the game ended before I could get my second Comet going. It would've been interesting to see the four of them running as a pack. I didn't notice the debuff much on the AEC. Tread shot seems to work all of the time.