I was able to find the document so ill share it with you guys. Looks like the suggested fix is some new washers/bolt tightening. Apparently it was only supposed to impact certain VIN numbers but I've seen that the issue seems to be hit or miss across the board. Anyone on here have this issue?
https://www.dropbox.com/s/xkd2bkq59bk9vx0/Stinger%20TSB%20SA322%20Tail%20Gate%20Rattle.pdf?dl=0
https://www.dropbox.com/s/xkd2bkq59bk9vx0/Stinger%20TSB%20SA322%20Tail%20Gate%20Rattle.pdf?dl=0