I have the same issue. Just over 12k on the truck. It is driving me insane. I have crawled underneath and checked the sway bar links, all of the bolts on the skid plates, exhaust, etc... I agree, it sounds like my wheels are loose. Almost a plastic rattle sound. I know if I bring it to the dealership without pinpointing it myself, they will keep it for a day or two and then say they couldn't find anything. Doesn't affect anything, but is concerning. I'm open to any suggestions at this point.
***also pulled my front wheels and made sure the spring clips on my brake pads weren't loose.
***also pulled my front wheels and made sure the spring clips on my brake pads weren't loose.