I have for the Asobo/Inibuilds A310 the main-cargo-door as a belt for the bulk-compartment. I know this is not ideal, but I think there is no other way to operate all 3 lower deck doors. Actually, it works out pretty well, except for the travel paths for the Belt-trollys and that they overlap with the carts for the aft-cargo door.
Is there possibly a way for a timing offset of the cargo trolleys? Would imagine that the bulk is unloaded first and when that is done, the trolley for the aft-cargo compartment comes first. Is that possible?