Tom, I would look at putting a gravel pad, with a three concrete grade beams to actually support container above the gravel. Space second container from first so as to create a breeze way between the two. Then add a truss roof spanning both containers and breeze way, the ends of which could later be enclosed to create more storage / work space. Plan on adding an access door to end of container that doesn't have a door. Door can be in side wall facing breeze way.