Popping noise under truck

I have noticed when I hit a bump I hear a popping noise under my truck. It didn't happen until after 5K mile service. I usually hear it in the rear but now occasionally I am hearing it in the front when I role over bumps. Has anyone experienced this? Any ideas as to what could be causing this?

thanks

 

I get it, but it's inconsistent.

 

Body mounts. Have the dealer take a look.

G.

 

thanks!