I used a survival/ emergency blanket in the top of my summit hub to cut down on condensation and to retain heat. It helped alot and weights next to nothing.
I didn’t use any of the screws to secure the cover to the sled with no issues, last years model, held up in the SD winds perfectly. I removed the cover for the off season and stored it in a tote in the rafters of the garage so no problems with critters.