Hi Robert
Hope you don't mind me chipping in, we've used the 3-rung Little Giant for years having tried alternatives such as Telescopic etc, and can safely say they have and continue to be superb. Very versatile, sturdy and durable, we tend to use them in the extension format but sometimes as an A Frame, they are reasonably heavy which in turn provides a solid footing, most are still going strong after 5+ years but some have failed I.e broken hinge around this time.
I have not experienced the situation shown in the video although I can see how it can occur given enough leverage,.
HTH
John