2003 Toyota 4RUNNER seats problems

I was stopped on the highway behind a truck making a left turn when I was rear ended by another truck going 60 MPH. My 4runner was crushed between them, totaled, and my air bags never deployed. I hit the steering wheel so hard I bounced off of it and broke my seat from the momentum. When I awoke I had slid into the back seat (which is all that was really left of the vehicle). Although I am thankful to be alive, I feel that at that force, the airbags should have deployed!

The rear seat back rest on passenger side squeaks and makes a rattling noise. If the back rest is folded down the noise goes away. It seems to be the locking mechanism. Based on research on the internet, this seems to be a common problem. Dealer offered to look at it.