Wheel spacers
Like everyone has said. Install them correctly and maintain them correctly. And you will have no problems. I check mine every 5,000 miles ( Oil change. Rotate tires and check torque on spacers ). I've done this to many times to count. And I've never had a spacer nut move during re-checking.
I've had mine on for 3 yrs. Not a single problem. Running Rough Country hub-centric 1.5" spacers. Majority of shops won't work on anything with wheel spacers, liability issue. Wheel spacers work great.
I've had no problem with mine. I needed them in order fit wide 33's with the stock 17' rims. I forget which brand they were, but they are a pretty obnoxious red, and want to say they were about $50 each maybe.



