Interesting. What about in SRW configuration?The '99-'04 DRW F350's (both the 7.3's and 6.0's) had a GCWR of 20K.
12.5K conventional with a WD hitch, and between 12.4-13.8K with a 5th wheel/gooseneck.
That's Ford's recommended towing capacities. The Aftermarket upgrades don't effect that. These trucks have been known to tow more, but legally that's your cap.
The manufacturer's recommended GCWR (what you are refering to) is NOT what the DOT looks at when you get stopped. They look at the GAWR for each axle on each vehicle that is equipped with brakes. As long as none of your axles are over limit your are completely fine.The '99-'04's the rating was the same between the DRW's and SRW's.
It wasn't 'till the resign of the suspension and brake systems in '05 and the move to 17" rims on the DRW's that the ratings between the SRW's and DRW's changed.