Driving on the freeway when I heard what sounded like a gunshot. I kept looking around to see what had hit me. It sounded like it came from the right side of my truck. I couldn’t see anything amiss. I started hearing crackling when my hearing cleared up a little. I drew back the moonroof cover to find that the glass had shattered. I don’t recall seeing any debris strike the truck. I’ve saved video on my dash cam and can’t see anything from the roadway coming at the truck during that time.