FWIW: The F350 DRW spring pack is heavier than what is on the F350 SRW. The F250 still has weaker springs after the upgrade than the DRW. With upper and lower StableLoads, Firestone air bags, Rancho shocks and 19.5" wheels, my F250 could handle 8000 lbs comfortably on the rear axle using the OEM springs with camper package option. It is possible to make a SRW handle heavy weights safely and in control if you are willing to spend the money on the right improvements.
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Picture above of a 4000 lb truck camper and 8000 lb enclosed trailer hauled by my F250 for over 25,000 miles including crossings of the Rockies, Sierras and Cascades.
I plan to add 2000 lbs more of truck camper payload in the next couple of years so have upgraded my truck, otherwise I would still be using this combination today.