Target weak point stuns, though, so if you can pull it off you usually get the second hit, assuming I recall correctly.
If you hit a teller or regal, regardless, and you pop out, which takes 3 secs, assuming AT gun has to rotate to shoot, you will need to tell the AT gun to fire because it will lose tracking once the crew hits the ground. Then he will crit repair, you will hit it once, then he will jump in and drive off, and you may get a chance to kill it.
Also almost certain TWP cannot be used on abandoned vehicles, but I could be wrong. Either way I think it gives too much freedom to make a mistake here. Mines are nasty for a reason and they just don't feel as intimidating to the USF like they do to every other faction.
Also I hate the animation for crews leaving and getting in tanks: teleport here, then teleport there.
Again this is not some game breaking bug, I just don't like how it currently operates.