I have encountered 2 problems when I tested this plugin on my server.  Whenever I am driving around, turning left and right turns the camera in that direction, but does not turn the cannon with it. for example, turning right turns the tank right, as well as the camera causing me to look at the side of the tank, but the cannon stays in a fixed position relative to the tank.  When I try to look around with the mouse, the cannon moves with the camera, but stays facing off screen.
My second problem is that the rockets fired from the cannon travel at an extremely slow speed then explode a short distance away, making the cannon inept as a weapon.
I have searched the config for options to fix these but have come up with nothing.  Please help.

Did you ever find a solution for this because I am having similar problems?

Nope, been 2 weeks and no reply from anyone.  I just gave up and deleted the plugin, im guessing its dead.  I downloaded a plugin which lets me fly the attack helicopter and it had similar rocket issues and the author fixed it in no time, so Im just sticking with that one.

Yes campaign developer does not want to support it updates