Catapult Idea
There would be about three Mount points (Kinda like the Tank),
And one player shoots (It would have a delay time every shot),
another one drives and the last one is just a passenger.
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______
/ \
| A B |
| |
| C |
\_______/
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C=Person that Fires
A=Driver
B=Passenger
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OR, It could be like the Cannon, One person You click it fires, you
hold to select the amount of force...