Amazon.com: Rhino USA Trailer Hitch Lock - Patented 5/8" Locking Receiver Pin for Class III IV Hitches - Weatherproof Anti-Theft Lockable Pin with Dust, Mud & Gunk Protection - Used to Tow
TowSmart 2.75 in. Stainless Barrel Style Receiver Hitch Pin Lock with Sleeve 734M - The Home Depot
Lockdown 0.625 in. x 6 in. Self-Locking Hitch Pin at Tractor Supply Co.
23020 1/2" Locking Hitch Pin-23020
MaxxHaul 70050 Heavy Duty 5/8-In- Hitch Locking Receiver Pin with 2 Keys in the Trailer Parts & Accessories department at Lowes.com
Amazon.com: Elemake Trailer Hitch Lock - Hitch Pin Lock 5/8" Pin Tow Receiver Lock, Heavy Duty Brass Core Locking Mechanism, 3-1/2" Usable Length Fits Class III, IV, V Hitches : Automotive
BOLT Lock: Types of Locks
Amazon.com: Kohree Trailer Hitch Lock 5/8 Inch, Hitch Pin Lock for Class III IV 2 Inches and 2-1/2 Inches Receiver, Locking Hitch Pin Tow Hitch Lock with Key, Safety Clip & Anti