Hi Dog,
I don't know of, or can't think of, anything other than a slide awning that would serve the purpose. Obviously, a side benefit of the awning - it also provides some shade. They are virtually maintenance free however, it does make it difficult to dust off the top of the slide. If you park in a dusty area (such as in the desert) it's a good idea to knock the dust off before you retract the slide.
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