To quote another game's balance team, i would say it is "clever use of in game mechanics". I don't think it is breaking balance that much. Sure you can crush a few green covers leading to the points you intend to secure, but it could backfire greatly if you lose that spot and end on the trying to recover side of the problem. If anyone has a different opinion on the matter, i'd be interested to hear
It isn't just green cover. The truck can also be used to knock down buildings. The houses near each cutoff on Kholodny are a prime example of this. The truck can be used to take down your cutoff house so it becomes much harder to assault.