Fuck me running, that's horrible.
I'm far from an expert on the 747, but the last time I was on a cargo-configured 747-200 (the NAC jet was a -400BCF) the floor was definitely not configured for rolling stock.
The photos I've seen of MRAPs loaded in 747s (in this thread, in fact) had them loaded on 463L pallets, in order for them to roll on the floor rollers in the jet, and to be uploaded/downloaded via K-loader. Turning the wheels in any direction, chocking the wheels, setting parking brakes... none of it matters if you've got 28k of mass sitting on what amounts to a skateboard with little restraint.
Thinking out loud... maybe USTRANSCOM should let Fred and Barney handle the big rolling stock, and let NAC, Atlas, Kalitta, et.al. handle the pallets of styrofoam trays and rubber dogshit.
Also...
http://www.nationala...ght_NCR102.aspx