Gorilla Guard 2-5/16" Towing Coupler Lock
 

USED Gorilla Guard for 2-5/16" coupler. Works great, comes with both keys.

Sells for $40 new. Take it away for $20.

See it here:
Trailer Coupler Lock - Gorilla Guard For 2-5/16" Couplers Tow Ready Locks 63227

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The Gorilla Guard is a great way to secure the coupler on your trailer. It's still for sale!