When I was building my shop, 30x40x12, I fabricated a boom pole that I attached to the FEL and used it to raise the roof trusses for the shop. Later I wanted to put doors on my hangar so I welded up a 42' x 6' truss. I used the boom pole on FEL with a bush hog attached in back to raise that truss up 12' to rest on the supporting pipes. That, I would say, is the most precarious lift that I have done with my FEL. Wish I had some pictures of that.