CE Smith Boat Trailer Guide-Ons - Post-Style CE Smith boat trailer guide-ons make it easier to see the end of the trailer while on the road or when loading or unloading. The boat trailer guides protect your craft from damage and provide an additional measure of safety while trailering as they provide a visual aid for other drivers. CE Smith Boat Trailer Guide-Ons Feature Galvanized posts extend more than half-way into each non marring heavy duty 2 PVC tube for extra stability Boat trailer guides