From reading about it they mention an all-new hydroformed frame. Not sure what that means but I attributed the beefier numbers to that detail. I could be totally off though.
I have no particular brand loyalties but right now I fancy the Rams followed by the Fords. I think what swayed me is the under seat storage, floor storage, and the Rambox. I had a really good experience with Ford though. I traded my '06 Navigator for my current '11 Ram Laramie. Couldn't be happier (except that I didn't have the foresight to get a bigger truck for towing purposes).
2009 Jaguar XF Premium
2011 Kawasaki ZX10-R - Akrapovic EVO, BMC, ECU reflash, SS Brakelines, & Blockoff plates
2011 Ram 1500 Laramie - Crew, Rambox
2012 Harley Davidson Street Glide CVO - V&H HO's & PC-V