Master Lock Trailer Lock, Trailer Coupler & Receiver Lock Combo Pack, 3794DAT , Red

This is an excellent kit for helping protect your trailer. The ball lock works well once you understand how to use it. The hitch pin lock also takes a bit of practice to use easily, but it locks tightly and the cap that covers the keyhole is a bonus. It comes with both size pins, so it will work on any standard receiver. I am not a big fan of the coupler lock that came with the package, but I could tell it was good quality. I sold that on eBay because I bought a different coupler lock that I liked better. The whole set is same key, so that's also a plus. The reason I bought the kit despite wanting a different coupler lock was that the case it comes with is great. I am able to keep my keychain with my keys, extra pins, locks, and other trailer related hardware in the case. It is made of a good quality ballistic nylon.

This Master Lock trailer lock set provides a coupler lock, coupler latch lock, and a hitch pin lock, with the convenience that they are all keyed the same. We are using this set on my pop-up camper that spends a lot of time in storage, so wanted more that just the standard coupler lock.I like that there are two locks on the trailer that would have to be defeated, making my camper a harder target. Also, the hitch pin lock includes both a 1/2" and 5/8" pin, so it fits my current 1/2" hitch and I won't need to buy a new one if we upgrade in the future.This is a good quality set and I am comfortable that this will at least slow down all but the most skilled and determined would be thief.Highly Recommended!CFH

All the locks work well, the hitch lock is a bit tight but works well enough. The only reason for 4 stars vs 5 is the trailer hitch lock (not trailer ball lock) is pretty sensitive. It works great but you have to make sure you get it on correctly and well or it will wobble make noise or wont lock. All the rest of the locks are shove them in or on push them down and done. All in all pretty nice little kit.Pros:Well builtEasy to useone key to rule them all.Cons:Cheap keyssmaller trailer lock a bit finicky

I like that one key is used for all the locks. Works well on my Xterra.

It’s about the quality you’d expect for the price. I needed a new set after a relative borrowed my trailer and lost the lock and key for the trailer lock. (Don’t leave it on the bumper!) so what this does have going for it is this... you get 3 levels of security for your towing hitch/receiver. You also get 3 keys and all locks keyed the same. While the locks seems a bit cheaply made, this is a basic line of defense to thwart a thief. I personally feel that If someone knows what they are doing or wants it bad enough, they’ll figure out a workaround to get your trailer. Now the downsides... the “ball” that goes up inside is a plus shaped wafer of metal that forms the shape of a hitch ball. I couldn’t find a way to get any of the locks to close w/out the keys being in the lock. The key/locking mechanism seem to be cheaply produced compared to previous products that I have used. For the price of the 3 locking devices, I’ll keep them and see what happens. I can say that the locking bar for the hitch lock was about 3/4” shorter than my current hitch lock. It just barely fits into the hole and allows it to latch the lock to the bar. I don’t have any ability to turn the lock once installed so it’s either facing up or down but i can’t move it to where it would face me and unlock easily. I figure I won’t be locking and unlocking it often so it won’t be a huge deal.

works as described

Several nice things, the storage "pouch" keeps the lock handy and keys. My reciever pin lock is 8 years old and still unlocks with no problem- like others the black plastic cover on the"hitch" lock broke but the lock still functions. Some comment it appears flimsy and would break with a hard hit with a hammer - I would suggest they try it, not as flimsy as seems. A determined thief can destroy it but it's better than the yellow lock with u-bolt (they can be picked in 10 seconds). If you want total trailer security- get a wheel lock. This is quick, heavy enough to deter theft. Mine's 8 years old

Got this set because I liked the idea of one key opening all. Received Jan 2019, put on the trailer coupler lock and the trailer coupler latch lock when I got it, didn't put the receiver lock on until May, because I wasn't towing at the time and the ball mount was in the garage. In May, started towing and using all three locks until the end of October, when boat went into storage (locked up) and I put the ball mount away but left the receiver lock on because I figured it would be right where I could find it this Spring. Today, went to put ball mount on, but couldn't get receiver lock to unlock. Thought I had wrong key, so tried it in coupler lock - worked fine. Tried coupler latch lock - a little hard to turn, but it unlocked too, so had right key. tried graphite lube, then penetrating fluid, then prolong spray over the course of 2 hours - wouldn't budge. Got a little too wild apparently and broke key off in the lock. Figured it was now a fight to cut it off, but pulled out reciprocating saw and cut it off in less than 30 seconds. So much for security. Saw other review where they just smacked it with a hammer, so if it hadn't cut through like aluminum I probably could have dpne it with a hammer. Now I'm not so sure about the rest of the set. Definitely need to lube the trailer coupler latch lock before it freezes up.