I have not personally tested the Goldline covers. I did however look up the specs online as a result of your post.
My opinion is..... NO WAY.
The Goldline is made of polyester. I would be surprised if the cover lasted more than two years. Polyester cooks in the sun.
Want we want is a polypropylene cover. Polyprop is UV resistant. I am not aware of any polyprop covers on the market.
I got tired of spending the big bucks on RV covers that go bad after two years. Now, I get Heavy Duty tarps from Ace Hardware and replace the tarps every two years. I used to use Home Depot Tarps, but the quality is now so bad that the HD tarps only last a year.