Driving hard has nothing to do with it. It's all about speed in which case your design offers no advantage to a 2wd machine with the same motors as tooth engagement is all about speed ie how fast you can move in to an opponent between the time it takes for a tooth to leave the position of engagement with an opponent and the next one to take it's place and transfer the energy.

Really the ultimate drum/beater design would be one that had the wheels in line with the weapon on the same axis so that as it steered, the wheels are in line with where the gyro force is being applied (more efficient). All the current drum/beater designs are essentially the same with the wheels behind the weapon which isn't ideal. So on that basis, drop the back wheels and just have the front ones.