The individual beam lasers in the AFV turret only do 4d6 (=laser carbine). It seems a pretty weak weapon for a fighting vehicle. I know you can fire up to 3 at the same target, but that isn't particulalry awesome. Are we to assume that if you fire all 3 at the same target it is a 12d6 single attack, or just 3 4d6 attacks which have to overcome armor separately?