CE Smith 5 Bunk Board Style Boat Guide-Ons CE Smith carpeted bunk boards provide proper center loading of your boat even under high wind conditions. These bunk board guide-ons can be adjusted to accommodate your boat and trailer. The pre-galvanized steel support poles mount horizontally on either side of your trailers frame rail. Their pre-galvanized steel parts have been stamped from a thin sheet of steel and are rust and corrosion-resistant. Their installation is quick and easy simply slide th