We're looking at using a 20' shipping/cargo container as a storm shelter however I'm trying to determine how much dirt it can handle on top as well as figuring out a way to reinforce the container that will be safe. Getting load specs on them is either hard or I'm search challenged but here is what I was able to locate. Keep in mind the below numbers are for a 40'. The part I'm not quite clear on is what does it mean by transverse and longitudinally loading in relation to the roof. Since the load would be fairly consistent across the entire roof it would seem that using the lesser number would be safe. The issue is I want to be sure to add a lot of padding to protect against falling trees, debris, etc. Does anyone have recommendation here on reinforcing that has done it. I was able to muster up an old site that is no longer online but using the archive website got an old screenshot. At the bottom of the attached pdf you'll see where they put some bracing in to support more load however they don't discuss any of the engineering and how much more weight it can support with their mod.