The Rocktamer style of mudflaps seem to capture/divert about 75% of the gravel road spray from getting to trailers in tow. Coating the front of the Oliver with matching color bedliner would probably be, in combination with the Rocktamer flaps, the best for containing any pitting damage.
I've owned a couple off-road trailers and towed them extensively over gravel and dirt trails. The Kimberely Kamper, the last trailer we owned, had a fiberglass nose box that featured, from the factory, a bedliner coating that effectively protected the leading edge of same.
Just curious to hear from those that have pulled their Oliver trailers over gravel roads...for more than a few miles.
Thank you to all for your replies so far!
Dan