We went with a KingBird cover for our 5ver after doing a lot of research but in the end it did not even make it through one winter here in high desert of NW Nevada. It developed a long rip from the top down along a zipper.
I will say KingBird was very easy to deal with though, I sent them pictures of the damage and they refunded full purchase price and didn't have to return old cover.
2013 Arctic Fox 27-5L, B&W Hitch, Twin Honda EU2000i Generators, Tri Metric Battery Monitor, Reese 5th. Airborne.
โGoing to the mountains is going home.โ John Muir