I understand Atlanta is a major rail hub. I have been involved in logistics for 36 years.
Not that many trucks end up delivering in the Savannah metro area. So, they have to dead head in there to pick up a container.
Therefore, you pay more per mile out of that port than you do in compared to Cape Canaveral or Baltimore.
This results in the fact that you can not truck as cheaply from Savannah as you can from other east coast ports. So, you can not truck it as far.
Savannah has rails directly to Atlanta. Trucks are a small part of that picture.