I got my new Trailer Life magazine today, and in it is an ad for a product from awningpro-tech.com. They offer some nice covers that take care of the whole length of the awning and permit travel with it installed. I'm thinking of ordering a set. For my 16ft. awning, it's $100, add $20 for each additional 4 ft, or subtract in the same way.
As they show it, for transporting, it wouldn't cover the end of where the fabric is, so my expectation is that it would let water in. But I can see where a little modification would accommodate the issue. I'm real tempted. I bought some pipe at a lumber yard and was going to rig up something to just cover the ends to keep the water out, but admittedly that wouldn't stop the UV ageing. And it would be a hassle. This would be better. I think. Guess I have some stuff to return to Home Depot.