The MD-11 is seriously out of balance when empty, and if you off-load FWD lower first iso AFT, well, wallop it goes. Seriously, I've lost track of how many -11F's had a tail-tip. Seen piccies of quite a few, amazed that it can still happen.
PS
"We" don't use a tail-stand on MD-11Fs, which is a bit risky, but rely on "ze procedures" to keep this from happening.