What the heck is that noise?

I got in the car and headed to work. I drove over a bump and CLUNK - there was an awful noise coming from the driver's side in the back. Sounds like a broken spring or shock. I slowly drove over to the dealership clunking all the way and left the car. I have not heard yet what the issue is, but I am sure there is one! It could have been worse, and I am just grateful I could still drive the car.

I worked on Thor a bit last night. This is a shot of the back. Those rows of stitching are 2' long. I used more than a bobbin of thread quilting the first full section.