Just bought (2 weeks ago) a 2022 Trailboss LTD 6.2L (Still 2021 styling) and I am getting the same sound. I took it to the dealer also and can’t find anything so far. I have to be going about 30mph or higher and slow fairly fast to get to to happen when it warms up. When its cold first thing in the morning it is a little louder. Always seems to be coming from front end area. I took it to the dealer today though to let the sales person and manager hear what I was talking about and when I was leaving their entryway, which is rather steep, I was sitting waiting to exit (nose of truck lower than the back) it made the sound like a ball rolling and bouncing down the tubular frame, gas tank or something. Weirdest sound I’ve heard from a vehicle. Have an endoscope camera and going to look around within different things on the truck this weekend will let you know what I find if anything.