Some shops are scared to work on vehicles with wheel spacers. If they're installed properly there not going to fail, period. I rotate my own tires because I dont trust anyone else to do it. I have asked places to torque the wheel lugs to 90 ft. lbs. because I have wheel spacers and they appearently blow me off. I caught one shop just using an impact to tighten them when I specifically asked them to use a torque wrench.