Town is not listed because it's not relevant and frankly not anyone's concern. It's rust.
You suggested shaking GM's cage and pretend to have contacted the NHTSA and lie about it.
Maybe that's how some people conduct themselves but not me.
The question to your post was "why"? It's not GM's responsibility at the age of the truck.
I didn't ask for a diagnosis. It was a question about who might repair a rusted bracket on the frame.
No point now as I have previously mentioned, I have access to a qualified welder.
Would like to see before and after pics, if you get them and are willing to share.