Check it out fellas, this crane did all the large and heavy lifts for our new plant, some of the vessels are 200 feet tall. It takes 4 guys to drive this rig, 1 guy for each set of tracks and 1 guy to coordinate the trick, it also takes 1 guy to run all the hoist operations . I was in true amazment when watching the major lifts. As you can see in some of the pics that the thing has to drive on 3/4 plywood and the actual lift site has 16" x16" ties that it sits on, they string the ties out and bolt them all together like a big pad, when they get to the lift site they rotate the back set of tracks 90 degrees from the front ones and that is how they swing the load into place. I had an opertunity of a life time watching this rig do its job.