2018 Silverado Bad Body Mount?

[davidsp101]

Looking for help here.  I have a clicking coming from under the driver’s door/floorboard.  Only happens when the temps are between 65-85 degrees, but is most noticeable on muggy mornings (unfortunately every morning on my way to work during an SC spring/summer/fall).  I have tried tracking this down since I bought the truck 2 years ago.  I’ve had my buddy rock the truck back and forth while I’ve been under on a creeper and the noise sounds like it’s coming from the cab mount, but I can’t be sure.  I have read about the older models needing an insulator, but I haven’t seen anything about the 14-18s needing them.  Has anyone had this issue?  
 

By the way, the truck has been to the dealer several times and two off roading shops.  I have ruled out any issue with the suspension.  

Here’s a link to the noise:

http://www.youtube.com/shorts/6AhDCAg2gtk