When a shipping container is delivered, the driver sets one of the short ends of the container on the ground and drives out from underneath the container. The shipping container and delivery truck make one long straight line during this process.
Standard shipping containers come with cargo doors located on one of the short sides of the container. When the container is loaded on a truck for delivery, those doors can face either towards the driver or face out towards the back of the truck and the street.
As such, the direction that the doors face when loaded onto the the truck for delivery, determines how and where you will be able to access your container.