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Cannon

You can fit 3 explosive barrels in it.

Movable via pushing, you may have to make the wheels unbreakable (if they aren't already, because i set them to be unbreakable)

You can freeze it when you put it in position, or if you want a recoil effect, don't freeze it.

You can change the angle by putting something under it so it stays higher if you are not happy with its direction.