Tie Down Adjustable PVC Boat Trailer Guide-Ons Make loading and unloading your boat easier with Tie Down Adjustable Boat Trailer Guide-ons. These guide-ons are galvanized for long lasting protection and include heavy-duty steel component parts. Each PVC guide has a bright orange end cap for increased visibility when loading your boat. Tie Downs Adjustable PVC Guides adapt to most tube and channel trailer frames. These boat guide ons are 48 high with up to 16 of side adjustment. Sold in pairs wit