I am considering buying a container, but I will probably have to have a slab foundation. most of the companies that ship the containers can’t unload a 40 footer with a forklift so pier based foundation might be out of the question. I have to contact the local laws about using one as a housing unit though and see if I can find any loopholes. I thought about burring one, but they don’t really recommend it since the containers can have them stacked high the walls are actually extremely weak in that instance and could cause a collapse. Then there is also corrosion you have to worry about. I don’t think I will need to worry about cooling though considering where I am at. It rarely goes above 90 degrees during the day and at night will always plummet back to around 60 degrees.