Lugs nuts are the same 250-350, bolt pattern changed in '99.
The only F-250 DRW's I've every seen were conversion do by a truck outfitter. If memory is correct 5R in Golden use to supply local dealers.
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It's got a shit-ton of leafs on the rear suspension. It's got 4 springs on top of a shorter flat spring and then it has what looks like an overload(?) setup with another 4 springs on top.
And standard 8 lugs front and rear on the wheels.
You know us propane truck drivers get paid more money than we can possibly spend.
[hahhah-no]
Maybe the solenoid pack.
https://www.youtube.com/watch?v=_CnFAcVO20E
That's way over my head.
Back to your original F250 dual. If memory serves for sold the duals as a stability feature in the era. The one tons had the same tow rating with or without duals. Probably a cost savings to have a low GVW dual. That is one of my favorite body styles. I'd still have it were it not for it not being car seat friendly.
I just saw a 90's F250 single cab long bed that had dual rear wheels. They're out there.