Folks, I never said I thought someone was trying to steal my wheel/tire. What I said was lately we have had some instances in town where kids have been playing around with peoples car, and I think someone may have loosened the lugs on the one wheel just to be funny.

Anyway, that apparently was the cause of the knocking sound as once I retorqued the lug nuts, the car was fine again.

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2012 Mercedes ML350 Bluetec 91K (hers)
2005 Corvette 55K (fun car)
2002 VW Jetta TDI 231K (mine)
1998 Volvo S70 T5 Turbo 196K (kids)
1994 Ford F150 4WD 249K (firewood hauler)
1983 Mercedes 300D 376K (diesel commuter)