How much stuff is in it? Could be easy to get a farm jack in one of the corner blocks, jack it up and put suitable paving slabs under the corners that need it. There not that heavy empty, we've lifted them to level them with a couple of scaffold tubes.
They are a good bit of kit. Last ones we bought about 5 years ago were £1400 each and they were 3 months old. They come from China on a one way trip, as we have nothing to send back in them.
Sorry Walsie just read your post properly. Could you not pull it from the top. as if you wanted to tip it over and get some gear under the needed ed