I'm concerned about two things with the AT guns:
1) Gun is in the open next to a hill/building. The crew are behind said hill/building and so can't be shot at. If a tank reveals itself they take their first action to move one guy to the gun and second to fire. If return fire kills him, the rest of the crew are still safe. Rinse, repeat.
1a) Proposed alternative: Either make stats for the gun, so if left behind it can be destroyed, this would also help to represent the gun-shield as it would soak up at least one shooting die (generally the highest, no less!) Or allow it to ignore its Slow trait if more crew are touching it to encourage the unit to remain with the gun.
2) The "Tracks/x" trait allows for (admittedly less accurate) pop-out attacks. So the tank never has to reveal itself to fixed position AT assets. I realize the game never makes things this simple, but still. I would actually like the "Tracks/x" trait better if it didn't allow shooting, but was a little faster. This way it would be more like a "full speed ahead" rather than allowing it to pop-out.
2c) Proposed alternative: Only allow tanks with gun-stabilizers to fire while using the "Tracks/x" trait. All others have to use an action to move and another to shoot.