its not that that you have to worry about. frame rails are different widths apart. so youll have to figure out a way to mount it. and youll have to have different height mounts because bed isnt flat on the bottom.
Pretty sure he will still have that gap between cab/bed.(or is that only with xcab/crewcab?) But yes, frame rails aren't the same width. Cab/chassis rails are narrower, as is the axle I think. There is one locally that did exactly this...rear tires tuck way inside the fenders...just looks goofy to me, but I'm OCD about that stuff.
I know on some cab/chassis trucks there is a gap. Not sure if there is on a reg cab or not. Hopefully someone with experience will chime in here soon. A little google searching should get you the difference in widths between a chassis axle and reg DRW axle.
There have been several afremarket companies that made F550 pickups. Fontaine and Classic Coach were two of them. They made a fiberglass spacer that bolted on the bed to fill the gap. I have seen them for sale on ebay. Do your homework and I'm sure you can find one.
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