We have a slide out cover for our 179---but, it is canvas. I don't know the brand or manufacturer  because it came with the POd when we bought it used from a dealer.  It works well-it does keep branches, leaves, etc off the slide out roof.  We use a standard sheet rock bucket with screw lid for the "ladder" and it is easy to install. When it's wet, we roll it up and stuff it in it's storage bag and hang it on a clothesline when we get home.

I would say that it works a lot better than nothing, but obviously not as good as an automatic unit. It does require some installation/removal at each campsite and can be a pain if wet. It doesn't seem to flap in the wind. It's not pretty,but effective.  I guess I would buy one if it was $75 or so.

Vann

I agree re the stepladder approach. A ladder has many other uses around the campsite besides accessing the slide. I use mine to put up and take down my directional cellular antenna among other things. Its also useful for putting up either a rdome or free standing awning or tent. 

When we got our 179 in July 18 it did not come with a slide out awning and I found while camping in a forested area like we find in Michigan you can accumulate sticks, acorns, and some leaves.  We now have one of these awnings.  If this debris is on the top of the slide out it will premarital damage the weather seal for the slide out which means removing the debris before you move the slide out in, every time.  These awnings are a little pricie but they keep about 90% of the debris of the slide out roof.  Still have to check the roof before sliding in the slide out.

Hope this helps.