This morning I called the Emery ramp chief at GSO to find out any news about the crash. It's almost certainly a case of the loaders not putting up the locks on a partial load. He thought that positions #2-4 on the plane were empty, and the loaders probably forgot to put the locks up at can #5. It was left to slide about 22 feet down the fuselage, causing massive balance disturbances as it slammed back and forth. The can could have been 2 tons or more.
Even worse, the people who made the mistake were from my company (Miami), who do the ramp service for Emery in Sacramento.
That plane came through GSO last week, and my friend said the rails, flooring, and locks on it were in fine shape. It was just a case of unbeleiveable ignorance on our part.