Same for me, I didn't have them on my truck with my old enclosed and the front was really dinged up... I wouldn't pull my new or any enclosed trailer without them.I have them and they work great for keeping stones thrown from the tires from hitting what I'm towing. They do knock down on the snow & slop but don't do much for the salt spray. I bought them specifically for protecting the side x side windshield when hauling on the open trailer. Also has sure helped in reducing the little dings and nicks on the enclosed trailer from all the dirt stones and sand on the roads in the winter.
Thanks!!Rupp summed it up pretty well. Look at the brand rock star, not cheap but have been happy with mine.