Railroad Jacks
We used similar jacks to set rail cars on the tracks. The units we used were rated at 50 tons. Yes, they are very heavy! 'Course, the would work for most heavy lifting chores. One of their unique attributes is that little toe down close to the base. The base is split so that toe will set even with the base of the jack. It can be used under heavy objects that have minimal clearance above the deck! You just need to slip the base lip under the object and you can get it off the ground, block it and take it up in steps! GregH