I was following your theory Paul. That's exactly how I was looking at it. But the problem is, I dont do a very good job of explaining my questions. In a pure one direction loading, the I beam must be stronger as there is math to back it up. But you know how it is in the land of farming,......there is no perfect loading. I'm really trying to figure out whether to use square or rectangle tube for a hitch on the back of a chisel plow. Not as large as the size I put up, but there would be side loads and all that other unforseen stress that gets put on it in the field.