Protect your trailer when you are not using it. Reese Universal Trailer Coupler Lock guards against trailer theft, with a Heavy Duty die cast steel construction. Ratchet design with eleven locking positions works with all types of couplers. Easy to install and remove, protective finish resists rust. For 1-7/8", 2", and 2-5/16" Couplers. Comes with 2 keys. Manufacturer's part number: 72783
This product indicated it will give you peace of mind that your trailer will be safe. It is listed to fit up to 2 5/8in hitch. It fits looser than I would like and leaves me woundering how safe it really is. If a thief wants your stuff they are going to get it no matter what you do.