Singular Loud Bang Under Cab

[Olvim]

Hey guys, looking for some help or ideas. 2018 Silverado z71 crew can, 5.3 6 speed. Driving to work this morning on a slightly slanted road at approx 25 mph, I heard a loud bang or pop (as if I had tossed a massive stone or something) underneath my cab (underneath drivers side floor or seat behind the wheel well). First time I’ve ever heard it. Truck has 19,300 miles. No changes to RPM, oil pressure, or tire pressure immediately after. Pulled over and looked for any damage and found nothing. Truck is running normal with no codes and it did not recur. 

 

I finished driving to work and drove home with no issues, as well (approx 40 miles in total). I know the previous models had common issues with body mounts popping with frame flexes, but thought that was corrected in the K2s. Any thoughts on what this could’ve been? Wondering if I should take it in to have it looked at or not. I’ve had rocks hit my running boards before and echo loudly off them since they are mostly hollow, but this sounded excessive (or huge). I saw nothing at all in the road that I could’ve hit before it happened. I’ve had bad catalytic converters before and backfires with other vehicles and this sounded nothing like either. 

 

I’d appreciate anyone’s thoughts on the matter or to know if it’s happened to anyone else, as I’m completely stumped. Worth a dealer visit for a check, or wait and see?

 

Thanks!

[Olvim]

Washed my truck and found this giant gash in my running board. Whatever it was, looks like it was something I threw up from the road while driving. Maybe a wheel weight - gonna have that checked. 

 

I suppose this is enough evidence for me to accept it likely wasn’t mechanical in nature. 

[Lsgun1]

I'm sure it was on the road.