Did you ever get your problem taken care of? I am having a similar issue with mine. I can see where a captive type nut has pulled through, halfway up the mounting bracket. Also looks like the brackets (held on by rivets) are beginning to pull away.
I must confess that I did hit the side of my shed with the awning once and that my contribute to my issues. I'm just trying to figure out the best fix.
Don & Kim
Willow Spring, NC
2012 Rockwood Ultra Lite 2604
2013 F-150 4x4 EB