Don't know if anyone has seen this, but it's a frame twist test of sorts, between RAM and Ford duallies.
http://www.musclehorsepower.com/frame-twist-test-2014-ram-3500-vs-2014-ford-f350/
Seen it. Chevy did their own comparo with the Ford, but with 2 or 3k lb in the bed. Destroyed the tailgate on the Ford. It's on YouTube too.
Ford is a like a limp pasta noodle compared to Chevy and Ram. Somewhere on the net Ford guys have some contrived justification for why flex is good...
I think they are all better than they used to be. Remember the 70s and 80s when every pickup that got driven off the highway had matching dual dents in the back of the cab, right in front of the box corners?