Swing loading like that can also cause problems with instability due to harmonic resonance. Plus other issues like differing weight of the loads, how securely the loads have been packed, whether the release catch works when the pilot dumps the load in the truck, or the load comes loose halfway through the loop etc. can turn a smooth ballet into a catastrophic scenario in short order.
It is a bit like saying that if someone can juggle 3 balls, then they should be able to easily juggle 6 balls because - inertia.
