Can the storage container be positioned on any surface?

Care must be taken with this. All surfaces where the container is to be sited must be flat hard standing. The loaded weight of a storage/shipping unit is designed to be supported on its 4 bottom corners which need to be level with each other to ensure the unit remains square so the doors open and shut easily. The ground at each corner or the whole area must be solid enough to take the required weight and can be concrete, concrete paving slabs, railway sleepers, a firm stone surface or similar.