3 tons is tiny. An empty shipping container weighs at least 2 tons. The actual ISO 668 limit seems to be 30 tons. https://en.m.wikipedia.org/wiki/Intermodal_c

3 tons is tiny. An empty shipping container weighs at least 2 tons. The actual ISO 668 limit seems to be 30 tons. https://en.m.wikipedia.org/wiki/Intermodal_container https://en.m.wikipedia.org/wiki/Intermodal_container