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We've had double barreled, triple, and quadruple barreled guns, even more barreled pistols, double, triple and quadruple naval gun turrets, but I don't think I've ever seen a double barreled tank (both barrels in same turret), while it has apeared numerous times in fantasy works, most prominently C&C's Mammoth tank.
My question is what exactly prevented it from happening and what makes it bad? Question inspired by recent Darth Vader as Wilhelm II thread