packing/loading

Hi experts,

Example:

outbound delivery - material A (10pc - 15 cbm), B (15pc - 20 cbm).

There're 3 types of truck: big (to load 30 cbm), medium (to load 20 cbm) & small (to load 10 cbm).

Q: If using big truck & small truck to load, how to map it in SAP system? Should it be used Z-development?

ps. Not configure shipment & route in the system.