Chica- What part of the roller is chipping the gel coat? Usually the roller protects the bow very well. The only metal that could do it that usually on the bow roller would be the bolt head on one side of the roller or the bolt shaft and nut on the other side, unless the metal bracket for the roller is grossly oversize for the roller and extends out beyond the roller's sides. Is the strut that holds the bow roller loose or allowed to wobble from side to side? If you need to laterally strengthen the bow strut, it can be done with metal channel rail fairly easily. I'd suggest you look in some of the trailers in the EZ Loader, King, and other trailer manufacturers to see how the front bow roller is supported and compare them to yours to see if and how your bow roller could be reinforced. It couldn't be the winch handle that's scratching the boat, could it? How about a loose anchor? Do you have a secondary safety tie down chain or cable besides the winch cable? How tight are you making turns? Could it be the tailgate or something else on the rear of the tow vehicle that's causing it? Hmmmmmmmmmm?????Joe.
I have a doubled pair of rollers mounted on either end of a 1 foot or so length of U-shaped channel with a hole in the center that fits into the hole the single roller would go in and allows the double roller to pivot and adapt to the shape of the bow. This is on a 4500 lb EZ Loader tandem trailer that is about 18 years old, but I've seen the set up on later boats.