I have aluminum spacers similar to OP's on my k2500. I've put 7500 miles on them, about half that pulling a camper - they have been fine. Not a single loose stud. I wouldn't use them if they weren't hub centric.
Might just be the placebo effect, but the truck seems to handle better with the rear wheels spaced out. Especially while pulling the camper.
Might just be the placebo effect, but the truck seems to handle better with the rear wheels spaced out. Especially while pulling the camper.