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The Tow X - 8" jockey wheel... super affordable for those big requirement
 
This Jockey has a 4 bolt swivel mount bracket, 8" rubber tyre and metal inner wheel with a huge rating of 450kg. Can be fitted to your trailer draw bar with U-bolts (sold seprately).
Just pulling the release handle to allow the jockey wheel to swivel to a vertical position for quick deployment, or horizontal for safe storage whilst towing, has a travel distance of 250mm and is zinc plated.