Could have been used for a cpu and had a few pallets with space between, loosely shrikwrapped and the load on the pallet could have shifted. I've picked up some customers and it seems like every order picker loads their own pallet, one pallet will be 2ft high and the another one stacked 5ft.
everything you say is true, blue, but I can't see this scenario really being the overriding factor in the accident(we have nothing but this brief news report so we have little to work with other than the conclusion stated). Generally, an order picker is going to put the heavier stuff on the bottom. To do otherwise would make more work for him and crush the lighter boxes. Usually when a truck flips over , it is because of speed that was excessive for the curve (been on exit 16W off the njturnpike?, there's a beauty of a curve) .
People manage to pull containers loaded to the top from the bottom with a very high center of gravity and get to their destination without an incident. Driver error probably played a part in this accident (too much speed)
We got a lot of casuals driving now chasing the carrot of possible permanent position. Driving unfamiliar equipment while trying to be stick out and usually the only way they think that they can do that is to do everything in the shortest amount of time.