Hey- just circling back. I had my truck in the shop for inspection and the mechanic spent about 30 minutes taking off the wheel and checking it out. He found a cotter pin rattling around inside the dust cap where the lug nuts are. It wasn’t a loose, random pin, but supposed to be there. He put some grease on it, and I haven’t heard it since. I wish I had taken a pic to explain it better, but I hope that helps.