I wasn't going to say anything
but, I lost 2 covers in about 2 weeks roughly 1000 miles of driving (glad they were cheap). however it was always the same wheel that it came off of so maybe bent rim? I ended up finding a threaded hole right in the middle of my front hub and back hubs so I was able to put a 3 inch bolt right in the middle of each pan to hold them on.....I haven't lost any that way