Wheel spacers - good, bad?

[LONGHAIR]

As far as "clamping force" between the stud and the nut. all you need is for the nut to be fully enguaged. The stud really doesn't need to stick through...it just wasted threads after the nut has screwed past them.

If the wheel is not "hub-centric" a small spacer that still allows the nuts to be all of the way on will make very little difference. I'm sure that some engineer could calculate some difference...but in real life, it's above the normal use of the truck anyway.