Lots of folks with vintage trailers have made awnings out of Indoor/outdoor fabrics such as the Sunbrella ones. They are acrylic so they dont fade & are mildew resistant. Great for providing shade but its not water proof, just water resistant so you will not get the same level of rain protection you would get from a heavier vinyl type awning
One place a lot of vintage trailer folks use to have their awnings custom made is Marti's Awnings
. Lots of photos of custom awnings on her website. She BTW does a GREAT job of sewing the awnings.