who thinks they know what this wierd sound is?

[blueb8llz]

ok, im almost sure i know what the prob is. one of the guys that had the same problem replaced his rear bulks and the noise is now gone! reason for replacing was because the screws from the skid plate going onto the bulkhead was stripped.
and last night while examining my truck again, i titened all the screws on the rear of the truck and i did notice that i had one screw stripped exactly where the skidplate goes onto the bulkhead. i tried many screws but still wouldnt get tight. i really hope that this was the problem.
hey guys, is it bad if i didnt replace that bulkhead? its only one screw should i wait till it gets worse..whats the worst that can happen. i sorta dont feel like changing it just yet since i think its just a stripped screw.

thanks