Very interesting. I am wondering if something underneath has to be re-tightened or maybe a fastener replaced after being removed. My parents had a F-150 that you had to replace a bolt on the brakes every time you either replaced the pads and/or rotors.
I forgot to hop on here and tell you ours started to rattle a little more on the highway. I pulled down on the headliner near the glass roof and realized its held up by magnets (or at least it seems) I think some foam up there might do the trick to help reduce the transfer of vibration from driving....
My creak was coming from the flimsy adjustable rear hatch floor. By taking a blanket I lay on top of that floor, and tucking the edge of the blanket into the crack between the adjustable hatch floor and rear seats, it holds everything in place. No more noise.
I believe mine is coming from there too! I've actually had my rear driver side seat fall forward from a hard brake! Note: I never even put my seats down and had only done what you did, pull it down and then slam it back, pulled back and forth to come it was locked when I did this. But this incident happened months after I did that, with it not being touched since!
I have a creaking coming from right rear upon take up of drive and releasing throttle to overrun, got technician from dealer to lie underneath in car park while I rolled wheel back & forth in park with park brake off and he affected it by grabbing hold of outer driveshaft joint, ordered a new driveshaft and wheel bearing to cure.
