1. No.
2. Static objects' "lives" are a subject to tune, now tanks are too hard to kill.
3. No at most cases.
Btw, damaging or destroying Kamaz that is going from the firing range will give you -20/-30 points, making player heli damaged -20 points, following return route +3 points, return to base +10 points, all targets destroyed +15 points.
You may open mission in mission editor and see the goals, points and vehicles.