I have a 21' DC and I cover it. It's a pain but I hate leaving it open. I had a canopy similar to Francis's without the sides ($150) for my last 23' WA. Out of the box it was too short but I used 1.5" PVC to make it taller and it worked great but the wife hated it. I'll probably be doing that again since the cover is such a bother.
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