We live in North Idaho, where we experience snow and ice. We use a Clamark cover for our Oliver, and it has been excellent. Our Oliver is parked on the side of the house next to the garage and fence, so it doesn't get much direct wind. To protect against any potential damage, we place padding on the sharp corners, such as the bumper and solar panels, ensuring that nothing gets scuffed. I haven't noticed any signs of the fiberglass being scratched since we have a ceramic coating. If it were exposed to more wind, however, that could be a concern.
Putting the cover on can be a challenge, but we've developed a great system that makes it relatively easy. When we take the cover off, we roll it up so that it fits in a plastic tote. We roll it in a way that allows us to simply lift it out at the end of the season and place it on top of the Oliver. Then we roll it forward and let it drop off the sides. This method is much easier than the first time we rolled it on on the ground and tried to lift it up and over.