Rattling sound under truck.

So I took a hunting trip in may and all the roads were gravel. Ever since then I have a rattling sound coming from under the truck that sounds like a rock rattling around on a heat shield or something like that and it's driving me nuts! I've looked around and cant see anything but I also can't see on top of the heat shields. Anyone else find any rock traps on theirs that I can narrow my search down to?

 

I’ve had the same rattling sound and I haven’t driven down rough roads. I got oil change and they couldn’t figure it out so I dropped off truck yesterday for them to look at Hoping to hear back today. Originally I thought was hanging spare tire chain but I zip tied the chain and still makes noise

**update***
They are saying it’s the drive shaft and they are replacing it. Ordering part to fix in about a week