I know its not in The O.C. but I have a friend at Van Nuys Awning. He's repaired many and even made one or two for friends using the good Sunbrella fabric.
What he does is sew on a short section of new material where it attaches to the coach, that's where they usually rot out.
PM me if you want more info. You can remove the awning and take it to him so you don't have to lug the trailer and back it into his yard.