These jets tend to operate with a palletised 'flat' floor, all locked in with conventional lower deck type restrain systems. from what I have seen Hummers etc are just driven on and moved into position and restrained to the pallets with 5000lb (usually) restraint devices (strops). Its all rule of thumb stuff really. Interestingly the C17's the RAF were using into MALI with French wheeled APC's, the French Government were using 747F's to move the same out of OAKB - again main deck loads using transfer loaders. Just goes to prove that the routine can jump up and bite. Sad day for the cargo community.