Yesterday I found my spare tire, located on my back door, had lost 1 of the 2 bolts & the other was loose. I kept hearing a strange noise. Well I was at the store & had opened the rear door to put in the groceries. The tire wobbled side to side. OH CRAP ! ..... got it home & removed the tire cover. Put in a new bolt & tightened up the other..
Reason for the story is not many check the spare tire. So check out yours & tighten up the bolts.