I've never seen a factory awning for the back.
FWIW, my cargo trailers have cables for the ramps (rather than the spring hinges on the Funfinder) and I've found them to be trip hazards. I use stands under the ramp to hold it level so it is "open" all the way around. I also painted the surface white--it's harder to clean but a whole lot cooler in the summer sun!
Florida Keys and far Northern Vermont
2009 Fun Finder XT245
2013 GMC Sierra