My ‘22 F250 has a 10,800 gvw upgrade as a part of the ultimate trailer tow package. This upgrades the rear end to the Dana m275 (same as the F350), upgrades the rear spring pack (one leaf less than an F350), and upgrades the receiver hitch to 3”.
This all adds 800lbs to the base 10,000gvw, which essentially offsets the added weight of the diesel. My factory payload sticker is 2,835lbs.
A full-on F350 SRW is usually 11,400gvw, so my truck is sort of a heavy duty F250. Mostly this is to offset the diesel as I mentioned.
Interesting that I didn’t see that on any build sheets when I ordered my F350. So Ford lets you kinda offset the Powerstroke weight. Not as beery as GM which is I think over 11,000 gvwr but better than losing all of the payload like Ram. Either way, the OP should probably just go with a 1 ton to get 4000 payload. I’m strongly considering the 310GK and my SRW has a 4030 payload. I have no doubt it will be fine. I will never get a dually. They are great for towing, but horrible for everything else.