Agree w/ Linedog... all that "engineering" just to bandaid a potential problem. It's the wrong combo. I cannot tell from the picture but if its a Lance 915 (a very common 9' wet bath), the factory specs are 2505# dry weight... Even if its an 825 series for short beds its 1,700# dry weight. "Nah, just air bag it and you'll be fine".
Its getting to be more that way, trucks are expensive so lots of folks "make do", creating hazards for others. It doesn't take a dually 350/450 to haul that but he is likely wet weight over his limits and that makes for an unpleasant driving experience and early component failures. Just sayin', its his wallet...