I've seen some people who have slit light pvc pipe and put it over their awnings. Cut in shorter lengths for storage. You can buy the same sort of thing commercially, but a =lot= more expensive. The various "Alumaguard" covers run from $200 for very short awnings to $800 for the longest ones and most are black. Why TF would I want to put a =black= awing cover on my awning when I live in AZ? Just another stupid idea from the RV industry. The =original= Alumaguards were at least brushed aluminum finish. I've spent about 3 hours looking to find them, but they seem to have disappeared in favor of black.
Lyle