Amazon.com: Kohree 5/8 inch Trailer Hitch Locking Pin, Solid Harden Steel Tow Receiver Hitch Lock with Extra Safety Clip & Anti Rattle O-Rings Fits Class III IV V 2 inches and 2-1/2
Reese Towpower Towpower Tow and Store Anti-Theft Lock Kit in the Trailer Parts & Accessories department at Lowes.com