I think they should do a real Karl as a Premium Tier X SPG. Buff its rate of fire up to 1/5 min so it would have four shots (which was its ammo limit in the first loader). It should devastate whole areas and leave an enlarged shell crater at point of impact. It should also use the "early" physics model with tank turrets flipping 30-40 meters. Commander, 2 Gunner, Radio Operator, 2 Driver, 15 Loaders.