There's no need to say things like this. People in the comments here are right. USF has access to 3 different mines at the same time. And i know that M20 is situational, so it goes down to 2 at the same time.
M20 mine -> 340mp 20fuel for 240hp light vehicle, need 70 muni for skirt, finally get 320hp wow!!
but 222 car easily counter M20 even 222 car is more cheap
M6 is good? too long to build and more expensive than teller mine (60 / 50)
echelon light mine -> u seriously use this mine? just do little dmg and stop vehicle few minutes
no one think this is "useful"
demo charge -> come on, who care this trash? and this is doctrine unit skill(assult engineer)
if u dont know what am i saying, just play soem USF