We call them operating engineers. You as the operator are responsible for the lift. They can give you fake weights and distances and you are the one held responsible. You also have the right to shut the job down if you do not want to make the lift. He was booming down to get the dozer away from the wall and the distance from the center pin became to great and over she went. With the hyd. crane you can not let it free fall like you could on the old riggs that had a clutch. As noted he should have picked it up and done a test lift at the distance needed on the top side keeping the load barely off the ground- then if the crane raises up it only drops the dozer alittle. I have seen picks where the dozer was chained onto the front of the crane to give it more counter weight. All new cranes have computers that will shut the controls off when you get in a off the chart area. It is when you overide these safety devices that you as the operator go to jail for killing someone. It is a great job and pays well- for a reason.