Trailer Coupler Lock — 1-7/8, 2 & 2-5/16 in

Source disclosure: Amazon Vine review of a free product.

This lock is the STRONGEST and BEST protection I have encountered! I have supplied a photo showing FULL 3/8" steel encasement that protects your hitch from potential thievery. Truly amazing hitch cover that will not be cut or removed by someone with a portable grinder or hacksaw. Added features include the SUPER bright orange color that says "STAY AWAY" and the fact that this fit my selected hitch easily and completely. The VALUE is another pretty good feature, I must say before delivery I was skeptical, but upon opening and hooking this up, I feel comfortable saying I liked the value.

Source disclosure: Amazon Vine review of a free product.

This is a very sturdy and strong hitch lock. It’s 1/4” thick steel construction, maybe slightly thicker. It’s very easy to operate, when unlocked the bar easily drops down. It slips easily onto the trailer hitch (pictured is a standard travel trailer hitch), and is very secure. I am not sure if the lock would fail if the lock is drilled out (which I don’t want to test), but other than that it would take a lot of effort to break the lock otherwise.

Source disclosure: Amazon Vine review of a free product.

Better than expected! It's very sturdy, well crafted, easy to attach. It fit perfectly. It's very secure. Works exactly as it should. Out of several that I have, this one I feel most confident and safest with. Very impressed! Will definitely be recommending this to everyone I know!

Source disclosure: Amazon Vine review of a free product.

If you have the right kind of HITCH for this kind of Trailer Hitch Lock you won't regret buying it. There are cheaper less costing brands out there. But they are all going to offer the same security. This lock isn't just a rod bent over your trailer tongue with a lock under it that can be beat off. It secures all the way around it. You aren't just going to walk up and beat it off of there.

Source disclosure: Amazon Vine review of a free product.

I own three trailer locks and this one is the most versatile while still remaining strong. We have one that has multiple layers of steel, but it can only be used on one size ball and not all style tongues. This can be used on all size balls and it works on all of our trailer styles. It's simple to install. It is heavy but not as heavy as others. We always use a wheel boot together with a hitch lock because people can still snag empty flatbed or cargo trailers by hooking up chains to their trucks and driving off. This isn't 100% secure but it is a major deterrent and for the money, this is a nice hitch lock. It fits all of our trailers well. I like that this comes with three keys.

Source disclosure: Amazon Vine review of a free product.

This trailer hitch cover is extremely beefy. The first thing you notice is the weight. It is very heavy duty and would not be able to be cut through. The entire piece fits over the trailer tongue and holds securely in the coupler. I tried to shift the cover in several different directions to get it off the tongue, but it could not be dislodged.
This hitch lock has a very simple design with a main cover, a thick latch that slides up and down between locked and opened positions and the locking mechanism. It was easy to install - place it on the tongue, slide the latch up into the coupler and turn the key.
When you're ready to use the trailer, unlock the latch with one of the 3 keys provided and the thick metal locking bar will release and gravity will pull the latch open. The latch has a catch to keep it for separating from the main cover which ensures it will not be lost.
Other than that, the paint coating looks thick and uniformly applied. There is also a rubber plug to protect the locking mechanism from the elements - extras were provided.
Overall a fantastic product!

Source disclosure: Amazon Vine review of a free product.

I recently purchased a heavy-duty trailer hitch lock from NIWNIW, and I’m very pleased with it. This lock is solid, secure, and very difficult for thieves to remove, which gives me peace of mind when leaving my trailer unattended. It’s also quick and easy to use, making it convenient while still providing strong protection. A great investment for keeping my trailer safe.

Source disclosure: Amazon Vine review of a free product.

This is a heavy duty, quality ,power coated lock and pretty much pick proof. It has 3 keys ,very unique not available anywhere I have seen to copy. It has a half moon shaped key and slot ,see pics. This is so heavy duty it would take a grinder a while to hurt it . Don't loose the keys ,as I don't know how you would get this off. Fits most hitches /ball sizes .Simple to install or remove. Much better than a pin or a padlock. Bolt cutters are useless on this.

Source disclosure: Amazon Vine review of a free product.

Excellent quality device! This thing is so secure and so strong that the hitch will come off the trailer tongue before this thing will come off if you don't have a key. Easy to put on, lock, unlock and remove. I like the bright color, but it does make a glaring contrast with the trailer itself. It's very heavy, so don't drop it on your foot.

Source disclosure: Amazon Vine review of a free product.

One thing I really like about this lock, is that it doesn't consist of multiple parts that disassemble. The locking tang has a keeper to prevent it from separating from the housing, so there is no way of loosing parts (other than the key, or the rain plug over the lock assembly. The key has an arc to the blank, reducing the chances of someone forcing it with a screwdriver. Housing is heavy duty. Lock works perfectly, and overall, the lock appears to function well. I am using it to secure a light set generator trailer which we use for emergency power at out house. Overall, a good product!

Source disclosure: Amazon Vine review of a free product.

I looked at some of the other locks on trailers in the lot and nothing else compares to this thing. Most of the others can easily be defeated by a good set of bolt cutters. I don't see any way to get this off the trailer hitch without physically damaging the hitch itself and making the hitch unusable. This is definitely cheap insurance and people should definitely consider some sort of protection like this.

Recommended

Source disclosure: Amazon Vine review of a free product.

Solid, heavy-duty construction. Your trailer will be safe until you remove this lock. Easy to use, includes 3 keys and 4 silicone caps for inclement weather. The bright color announces itself to potential lurkers. Highly recommend.

Source disclosure: Amazon Vine review of a free product.

This lock works perfectly! Great quality at a good price. Built sturdy and functions as it should. The trailer lock is easy to install and remove. It comes with three keys and four lock hole covers for replacement later down the road. Fits all of my trailer's couplers sized 1-7/8", 2" and 2-5/16". Highly recommend this lock to secure your trailer from theft.

Source disclosure: Amazon Vine review of a free product.

very, very heavy duty, and heavy, would be extremely hard to get this off of a boat or camper trailer for sure. come with 3 total identical keys and 3 black bendable plastic hole covers. nothing in the way of instructions provided, but after some working with it, i see the trick to get it locked is this:
-press the front tray on the front (a tongue with the insertion hole drilled into it) all the way into the unit body
-insert the key and rotate it all the way clockwise
-press the key down to depress the locking mechanism down its shaft when turned completely clockwise
-turn the kay while its pressed down counterclockwise as far as it will go
-remove the key
-lock engaged; add the plastic hole cover

im embarrassed to say how long this took me to figure out and get the lock to stay down and engaged!

nice finish too. The writing pen is shown next to product picture(s) for scale only (pen is not included with reviewed product.)