-11 is tailheavy on the ground, requiring strict discipline in loading, or it will tip on it´s tail.
UPS solves this problem by adhering strictly to a loading, unloading and fuelling sequence to make sure that the C of G always stays forward of the main landing gear.
Cargo uses ballast pallets, which are going to be loaded into the No. 1 position before unloading the rest of the cargo commences.
Fedex had some incidents with MD
-11 aircraft sitting on their tails and decided to hook the nose landing gear to a weighted trolley to prevent the aircraft from tipping over.