Trucks sometimes do not use their entire capacity

Issue description

Trucks seem to be improperly deciding how much to load into them for transport sometimes. When there is an empty unit storage requesting 54 of electronics, and there's 20 electronics at the factory output, it sometimes goes and loads 10 and makes the entire trip with less than capacity.

Expected behavior

Even if changes happen following 'initial assignment', trucks should check on arrival to see if there is an opportunity to make the assignment more efficient fuel and time wise.

Reproduction steps

1. Load attached save
2. Check the electronics factory output storage, the storage requesting electronics, and watch the trucks load inefficiently and fail to ever make headway in filling the storage.

Game version

Update 1 0.5.1a

Attachments

20230531_011.save

You can disable partially loaded trucks if you need more efficiency. Increasing jobs reservations upon arrival is something we'd like to explore but probably not at this point.