Random lound BANG for no reason?!?

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Andy B

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Wondering if anyone else has this?

Once in a rare while I will be driving along (2010 expy) and I will hear a loud bang like something hit the body of the truck from outside. This is very rare like 1 or 2 times a year tops. Sounds like a baseball thrown at the truckor something.

I know it's not an acorn/hickory nut/ etc. (no tree nearby by, no rolling sounds after impact, etc.). There are no new marks on the body anywhere. I almost wonder if it's a panel flexing and popping.

Anyone else hear this?
Any thoughts?
 
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