I have used swivel or flange lug nuts before and I've gone back to clamping plates where the wheel manufacturer recommends them. I think they do a better job supporting and stiffening the center of the wheel. They also look more appropriate when that's what the truck came with to start with.

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-