I used flanged lug nuts on my 2 ton for a while... until I learned they were supposed to have clamp plates and put them back on.
Don't have the link handy but in the Accuride wheel catalog under the 19.5" 8 and 10 lug GM wheels they call for the appropriate clamp plates in the mounting detail, and I think also give the part numbers.

The clamp plate adds some strength to the center of the wheel that flanged lug nuts cant quite compare to.

Grigg

•1951 GMC 250 in the Project Journals
•1948 Chevrolet 6400 - Detroit Diesel 4-53T - Roadranger 10 speed overdrive - 4 wheel disc brakes
•1952 Chevrolet 3800 pickup
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"First, get a clear notion of what you desire to accomplish, and then in all probability you will succeed in doing it..." -Henry Maudslay-