Whatever you do decide to put on it , remember that whatever it is will run down the sides and back of your ute when it rains.
I leave mine to battle the elements, and also have a new spare so i am lucky in that respect.
Of course the ultimate way to protect it is, take it of and fit a Hardcover.
But i understand that this is not always a answer to the problem. They are not cheap and are not always practical for some owners.
Cheers mate.