Proven Industries Model 2178 Trailer Lock, Fits 2-Inch Trailer Couplers, Made in The USA (Black-Square)

’m very impressed with this Proven Industries lock. The build quality is outstanding—heavy-duty, solid, and clearly designed to last. It fits my 2-inch coupler perfectly and gives me real peace of mind when leaving my trailer unattended. The machining and finish are top-notch, and you can immediately feel that it’s a premium product compared to cheaper alternatives. Installation is simple, the fit is tight, and the overall design shows that the company knows what they’re doing when it comes to security. Definitely worth the investment. I highly recommend it.

This is hands-down the best trailer lock I've ever owned. The Model 2178 from Proven Industries is an absolute beast. You can tell right out of the box that it's made with serious craftsmanship — heavy-duty metal, tight tolerances, and a snug fit on the coupler. It fits my trailer perfectly and installs in seconds. I especially appreciate the high-security Cobra 7 lock core, which offers peace of mind knowing it’s not a cheap lock someone could pick or duplicate easily. What really impressed me is how well it secures the entire coupler area — it’s not just a visual deterrent, it’s physically built to stop theft. I’ve used other locks before, but they always felt like "better than nothing" solutions. The 2178 feels like a fortress. Worth every penny for the peace of mind it brings. Highly recommended if you’re serious about protecting your investment.

The Proven Industries Model 2178 trailer coupler lock is a very well made. The welding, weight, fit, and finish were all top shelf in the example that I received. Although any lock system can be defeated with the correct tools and time, the Proven system is very robust and introduces a level of security not found in many less expensive competitors. This said, the 2" Model 2178 that I ordered through Amazon did not fit my particular application. The locking latch on my 2" hitch is equipped with an external yoke that slides over the ball receiver in the locked position. I contacted Proven Support and learned that they manufacture a Model 2178-A that is designed for my application. Proven Support did not reply to my phone call, and their chat line was initially slow to respond. However, once we made contact through chat, I found them very responsive and helpful. The fault in the product that I received from Amazon was my own. Proven Support was very helpful in getting my mistake resolved and in offering and exchange, free of restocking fees, with immediate shipment. I am awaiting receipt of Model 2178-A.

Great product. Made of heavy iron.Also, customer service is outstanding.

I’m very happy with my trailer lock. Exceptionally sturdy & easy to put on

Assembled very solid works as advertised and customer service is great !

This trailer lock is indestructible. The puck style lock is not exposed to prying or cutting. The key is not a usual tumbler key. It’s round with notches. I don’t know how someone would defeat this lock. It would take a lot of time to defeat the hitch lock and still have a hitch to hook up to. It’s worth every penny to protect your trailer investment. I have a utility trailer with a brakes, winch, battery, charger, cargo straps, box, and a vehicle. This lock and other anti theft devices discourage any would be thieves quickly. I can put my trailer on the street if I have to and sleep well at night.

I promptly received my order but unfortunately I ordered the wrong one for my coupler. The card in the box said to contact them directly instead of an Amazon return so I did. The provided excellent customer service and promptly emailed me a form and a label to return the lock. I just shipped it back and expect a new one in a few days. As for the product itself… this thing is solid! You would need a blow torch to cut it off once you put it on the trailer coupler. I was very impressed. Great family owned company right here in Florida. Highly recommend them.

Good quality lock. Put your chains inside the head as well. I would definitely recommend this lock. Worth the money.

Used to lock our travel trailer.

Works great, very secure and holds the safety chains within the lock housing.

After making initial Amazon order, Proven Industries contact me by email requesting photos of trailer tongue to confirm correct lock style was ordered. The lock was received a few days later. Easy to install and disassemble. Heavy duty components that seem very robust. Unique key should be very difficult to duplicate or pick.

This lock is and works exactly the way it was designed. The device is made of good thick stock and it will take the abuse of someone trying to remove it. Well done folks.