I was thinking of building an awning, but before I reinvent the wheel, I thought I would see if anyone else has done a similar thing. I was thinking of getting a big piece of lightweight nylon cloth, and sewing a piece of 1/2" or so rope into a fold along one edge so it would slide in the track that is already on the 179.
Then set a grommet on each outside corner and get some tent poles, rope and stakes. Might have door clearance problem so it wouldn't be the total length. My previous tent trailer had one but I learned early on that in the western deserts, one doesn't leave it unaccompanied. One also needs a short ladder or an upturned 5 gal bucket.