Just FYI the 747-8F has a Weight and Balance system. It gives real time GW, MAC CG, ZFW and ZFW CG. The WBS uses sensors mounted on the Landing Gear.
GW and MAC CG information goes to the FMC and IDS.
This info can also be read on the Remote dedicated display unit (RDDU) that lives on the Main Deck although ZFW and ZFWCG can only be read on the W & B Computer Display in the MEC.
