Check out this video on how vehicle carrier ships operate. It is fascinating.
For example, the newer vehicle carrier ships like the 2020 Siem Aristotle that carry VWs will carry 7,000 vehicles on 11 decks. It is like a huge parking ramp inside. Each car needs to be strapped down. They need 40-50+ drivers to load/unload the cars.
Enjoy.
Enjoy.