I ordered my GM with the lock on the opening to the tube where you put in the rod to lower your tire. It is keyed to my ignition key. I expect it is a simple retrofit on GM's that offered this option. I know there are some other after market kits that have cam lock keys which can be covered to keep out dirt etc. I suppose someone with a set of bolt cutters could still get the tire off but he/she would have to work at it.
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