The old Carefree awnings lock two ways when stowed.
1. The end cap nubs (1 of 4) rest on the awning rail and prevent the tube from unrolling in transit.
2. The awning arms lock to the side of the trailer using a slider that engages the stay brackets when stowed.
I think I have some photos on here somewhere. I will see if I can locate them.
"One of the best lessons I've learned is that you don't worry about criticism from people you wouldn't seek advice from."
William C. Swinney