I'm stuck doing the Cargo Solidarity By Ship mission of the 2nd campaign. I have built a ship dock that counts for that and a Container-Loading Facility that counts for the Container Packing Facility, but I can't figure out what I need to build for the Loading / Unloading harbor since my Cargo harbor (small) didn't count. Do I need to build a medium one, do I have to build the massive one for vehicles and containers, or is there something else entirely that I'm missing?