I was thinking, a fixed frame might work too, since it's going to be a small awning. If you're parked at a site for days/weeks, Rather than roll it up when you're done, you just unhook it and toss it in storage.
Fastenal or another industrial supply will sell aluminum tubing. Get 1/2" tubing and fill it with sand, then use an EMT conduit bender ($20 bucks roughly) to shape it into a rectangle a little wider than your door and however long you want it.
Stretch some vinyl or canvas over the tubing and use aluminum pop-rivets to fix it into place.
Above your door, mount some brackets that are "open" on the top, so you can drop the frame in and lift it out. Lastly, use some paracord or whatever you see that looks good hold the frame "up", go from the two outer most corners to a hook or something right at the roof line of your coach, adjust the length as needed to get a reasonable pitch on the awning.