Most important servers go on top (we can run relatively fine without one of them, but with reduced capacity, as long as the cluster primaries work) and run the AC for longer during mobilization (a full day and overnight) Also, this utility hatch had a broken gasket and loads of bolts missing. This has now been fixed to make sure the container is reasonably air tight.
I've also considered some sort of heater in the bottom of the rack to prevent condensation during the initial AC cycle.