Speculation on what happened...

[Snowcamo]

I bet it was a car that hit it maybe a semi. Whatever it was it low mostly getting the hitch. It could have been the hood heaving up or the cowel that got the tailgate. He could have backed into a low wall at a higher rate of speed maybe.
My buddy had similar damage on his 2500hd when he was rearend at +50mph by a car. Very little damage to the bumper and none to his bed, but his hitch was straight down. Plus it tore his frame.
 
It takes a ton of power and traction to bend the frame on a truck pulling something. Even if that was the case how did the tailgate get damaged? The hitch is just bent down to far for me to think this is the case. I'm not even sure the frame is bent in between the cab and bed. Thats where it bends when your pulling hard. The truck looks to be sitting pretty level, so maybe the the frame bend by the hitch pulling the bed down in the back
 
We will likely never know what really happened.
 
 

Sounds like a heck of a wreck.

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