I like where vehicles are at but i would like and increase of how many can be used per team. Vehicles shouldn't be pushing by themselves, foot soldiers should be pushing with them, tanks should make you afraid to stick your head out but it would help if vehicles players got an increase in splash dmg, vehicles should be better at flushing enemies out of difficult spots.
As for the stinger they have to decrease how many you get and its range cause the current maps are too small. Someone posted that its range is 700 meters while the biggest map might be 300 wide by 500 long with both HQ included, its too much of an unfair advantage if you can sit on your HQ and be able to cover the whole map
Don't have a problem with rpg since vehicles should be pushing along foot soldiers to keep rpg on check. Seen a lot of tanks pushing instead of pulling back that have low HP or can't wait for engineer to finish healing before moving.
Haven't used the AA, can't fly the jet at all. But heli should get a break when they fly off the map. Very hard to do with that range and I agree that it heli have too many lock ons on them but that has to do more with map size. If maps where bigger, then there would be a better spread and vehicles would get more free range to move