Hi Mark,
I replaced the original factory fenders because Tugger Toy and her King trailer had lived in Florida with the first owner for almost 3 years prior to us purchasing her and the sun had done a number on the gray fenders. Also, at some point in the trailers life prior to our purchasing it, the left side fender made contact with an immovable object obviously crushing the corner of the fender where the forward yellow marker light was positioned. The marker light had been replaced but the fender bore the scars of impact and as I was in the process of servicing things like brakes and wheel bearings and replacing the the sun damaged tires, I made the decision to replace the fenders at the same time. I have been extremely happy with the performance of these replacement fenders and the black color has held up very well. I also like the black fenders because they don't show dirt at all. The right side fender is the one that gets the most use for climbing aboard the vessel while on the trailer and I must admit that it may be getting a little soft on top but for the money, I won't have a problem if I have to replace it again in another 2 years or so.
Eric