I did add a solar cover to my HFGH covering the whole roof and south side. Even with the added support structure I was worried about snow loading. It would seem my fear was for naught. It is snowing here so heavily that it knocked out our DishTV but it appears to be sliding off as well as can be expected. The year we built it, we didn't yet have heat when we got a terrible Halloween storm. I was out there ever 30 mins. or so pulling the snow off with the pool brush.
The solar cover has performed above my expectations. It should only be a matter of weeks till we recoup the expense and it is so much nicer than the bubble wrap stuck to the inside. I bought either a 5 or 7 year cover, so it should last a while. I was thinking I may just leave it in place and see if it diffuses the light enough to not use my shade cloth. My shade cloth was a 10 year remnant I bough from GH Supply and is 50% black mesh. Your thoughts on this would be appreciated.