Hi John, I really don't want to disagree with you, but on this I'm compelled to. On these long boom machines, they do have a tipping point. For example, take a JLG 110HX, a very simple long boom machine. If you have the boom horizontal, and were to disable the boom length sensor, and telescope boom with no load in the basket (platform); long before you were to reach full boom extension the machine will tip forward from the weight of the boom. All of these long boom machines operate within what's know as an "operating envelope". Any boom position outside of this "envelope" is a tipping hazard. That's why they have systems/sensors that prevent an operator from positioning boom outside/beyond the operation envelope. One would think they should design these long boom machines to be more stable. But here's the problem; to make a long boom manlift stable in all boom positions would require 1) the machine would have to be very heavy for counterweight, or 2) it would require a large footprint like extended outriggers on a crane. Either of these would be a hinderence on a dirt construction jobsite. The compromise is to make a machine heavy enough (a 110HX is a little over 40,000 lbs) and wide enough to be manuverable on the site. But this compromise will restrict the machine to a working envelope of boom position. If the machine gets outside of this envelope, it can tip over. I am very curious as to the "rest of the story" on how this happened on this occasion.