My fault, they are 3305 lbs.
Michelin AT2 18", rating E.
So, 2 added up is 6610 lbs. Still, way over axle ratings. I have yet to take my F250 to the scale and weigh it, but my payload sticker says 2749 lbs. With the truck camper package, it has the same overloads as an F350, same axle for SRW, so the only difference is the 2" blocks vs. 4" blocks on the F350.
You can actually choose the 9900 lbs "package" when building your Ford truck as a "compliance" for local laws...so the number is meaningless from a practical standpoint.
Only the axle and the tire ratings matter, and what you are registered for locally. But, I'm not a lawyer, nor do I play one on TV.
Also, to the OP, the 6.7 diesel engine eats up 600 lbs of payload because it is heavier.