The guide said the average life of a container ship is about 10 years. The Savannah port also had several RORO (roll on/roll off) ships that day. The guide said tractors and other big equipment are the main thing ROROs carry in the Savannah port.
When flying with my buddy down to St Simons Island for a $100 hamburger I have seen probably 8 or 10 of these big container ships sitting out in the ocean waiting to go into the port. The guide said a “pilot” has to go out there and board the ship to oversee it coming into the harbor. Really an interesting tour about how all that stuff works. If anybody gets a chance to take such a tour, I recommend it!