I bought this jack to level out my 3, 40ft. shipping containers. They are all full. I used to use 2, 3 ton jack's together when they weren't full. But now, that was impossible. This thing lifted the whole back end of one and the only problem I had was the 6x6 block that I had the jack sitting on got pushed almost all the way in the ground. I had to keep putting spacer blocks under the jack. I could literally lift the whole thing up with one hand on the jack it worked so well.
And, this was on the toe portion of the jack. This is one heavy duty jack and I do recommend it.