It should be noted that the investigation of the Bagram crash indicated that the load shift - by itself - didn't make the aircraft unflyable. There is apparently considerable margin in the CG limits if the pilots are on the ball. Rather, the reason the Bagram 747 became uncontrollable was that when the MRAP broke loose, it smashed through the aft pressure bulkhead taking out several hydraulic systems. It was loss of those hydraulic systems that made the aircraft uncontrollable.