There should be ships too.
Battleship:
1000 hp. Good armor, so impossible to shoot with normal bullets. Can be destroyed by some RPG shoots or captured by killing everybody who is in the ship. Very large.
Passenger roles:
2 players use the rocket launchers.
2 players use the cannon(1 reloads, one aims and shoots; like the tank cannon).
the battleship can shoot from the sea and have a range of the half of the map, but its very slow and it moves automatically. It can carry tanks and jeeps(that swim in boats to the beach), helicopters and boats.
If the battleship is used can be chosen too when making the map. If the battleship is not chosen, all the machines should be in the base. When captured, all the vehicles get destroyed.
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When 2 vehicles collide, they should get damaged depending on the speed. So if a 200 hp vehicle collides with a 100 hp vehicle, the 100 hp vehicle should be destroyed and the 200 hp vehicle should have only 100 hp(at the max speed)