Your general approach has worked for me on two occasions when we had the van loaded up quickly due to nearby forest fires (one quarter mile away). The key was having a predetermined check list, so that each family member had a task and we could work efficiently.

I chuckle when I realize that one the first occasion I placed my sleeping baby daughter in the van, literally ready to turn the key and drive away, while on the second occasion, ten years later, she was in charge of downloading files from the home computer.

Nowadays, we would all just throw our laptops in the bag and run...