Ok, lets start:
1-In a full turreted tank, it works fine: wether in sniper or 3rd person mode when I turn the hull, the gun keeps pointing to the same spot (the camera direction does not vary).
2-In a td or limited turret traverse tank: in 3rd person it works fine (as full turreted tanks), but in sniper mode, when I turn the hull, the gun (or camera) turns as well (instead of keep pointing to the same spot).
If you still dont understand it, I record a replay and send you