I put steelies and hubcaps on my truck 2 months ago. The caps fit snug and I don't have a problem with them when I'm driving the truck.
But twice when the truck has been parked over 3 days and not driven one of the caps will just pop off. I find them on the ground next to the wheel.
This has happened on two different wheels. One on the front and the other on the rear wheel.
I would think if I had an issue they would let loose while driving not after sitting and they seem to fit just fine.
I have stainless caps on repop Ford wheels (wider) I'm not sure if that may have something to do with it. It's weird they fit fine then just fall off out of the blue.
__________________
1971 Custom C/20 
1970 CST 20
1970 C/30 Flatbed
1983 C/30 Dually
2015 Corvette Z51 2021 Corvette Z51 1991 Cadillac Hearse 1982 Cadillac Eldorado Biarritz 2000 Porsche Boxster S 2020 Jeep Gladiator 1973 VW Thing 1973 Plymouth Satellite wagon 1963 Baja Bug 1959 Bug Dune Buggy 1970 Baja Bug 1987 Jaguar XJ 350.
R.I.P. El Jay
R.I.P Jessie.
R.I.P Grumpy.
Every day is a gift from God.