I've taken the time to read through 90% of the reports provided by the NTSB. Although no concrete conclusions have been reached yet, the NTSB report does strongly suggest that the #1 MRAPV (mine Resistant Ambush Protected Vehicle) broke loose from its tie-downs during the takeoff sequence and smacked into the aft pressure bulkhead of the accident aircraft, taking out the #1 and #4 hydraulic systems as well as the horizontal stabilizer jack screw. (Or whatever it's called.)
Prior to the flight the flight crew had remarked on a broken tie-down from one of the 5 MRAPV's in the aircraft's hold.