On my 3500 Dually 4X4, About six weeks ago my left front hubcap apparently turned independently of the wheel causing my tire valve to shear at its metal to rubber joint. I noticed that about four of the plastic retainers for the ring inside the cap had broken, replaced the valve and the hubcap no evidence of turning since. Well last week I got a recall on some Pirelli Scorpions I had put on about a year ago, yesterday I had them changed out and noticed that the right side hubcap had some plastic retainers missing, looked at the wheel today after 70 miles since the tires where replaced and the right cap is now turning about 2 or 3 inches. Did a search thinking it can't only be me, but found nothing. Being a front wheel I'm thinking it must be under braking that the movement occurs. Anybody got any ideas. These hubcaps aren't cheap.