I decided I don't need an expensive cover to keep the leaves, dust and bird poop off. Got this module tarp for $75. Looks redneck I know, but it should do the job as good as a $300 cover. It has ropes to tighten it down where the green meets the white and at the bottom of the white. I plan to attach some HF heavy duty spring clamps to the C-purlins and clamp it to the roof when we take the 'toon out.
Mike
Mike