No, it has been said 1000's of times before, and i'll say it again -
"The ofp game engine does not support more than one gunner per vehicle, it never has, and never will do - so please dont ask again..."
The only way we may get more than one gunner per vehicle is in ofp2, but i dont know anything about it - so dont ask about that either.
btw, please dont take this the wrong way, but there are plenty of other posts in other threads about this subject....