A Heavy-Duty Bolt-On Trailer Winch / Spool is a high-strength, steel cargo securement device that bolts directly onto flatbed trailer side channels, providing secure anchoring for 2”–4” webbing straps. Rated for high working loads (typically 5,500–6,000 lbs), these winches offer, durable, corrosion-resistant, and flexible placement options for heavy load tie-downs.