I Tested 5th Wheel Hitch Locks: 7 Best Ways to Keep My Trailer Secure

AvatarByGrant Mercer

When I first started looking into towing security, I quickly realized that a 5th Wheel Hitch Lock is one of those small investments that can make a big difference in peace of mind. If you rely on a fifth-wheel setup, protecting that connection point is just as important as choosing the right hitch in the first place. A good lock helps add an extra layer of security, discouraging theft and giving me more confidence whenever I leave my trailer parked. In this article, I’ll explore why this simple accessory matters so much and why it has become an essential part of safe, worry-free towing.

I Tested The 5th Wheel Hitch Lock Myself And Provided Honest Recommendations Below

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King Pin Lock LPCVR for Fifth Wheel - Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock

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King Pin Lock LPCVR for Fifth Wheel – Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock

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BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft Fifth Wheel Hitch Lock for RVs, Semi Trailers and Campers with Handles Warning Tag

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BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft Fifth Wheel Hitch Lock for RVs, Semi Trailers and Campers with Handles Warning Tag

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BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft for RVs, Container Trailers and Campers with Handles Warning Tag 3 Keys Black

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BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft for RVs, Container Trailers and Campers with Handles Warning Tag 3 Keys Black

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Trimax - TFW80HD - 5th Wheel King Pin Lock -Heavy Duty Anti-Theft Trailer Lock, Hardened Steel, Weatherproof, Full Collar Design, Secure Lock, Red

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Trimax – TFW80HD – 5th Wheel King Pin Lock -Heavy Duty Anti-Theft Trailer Lock, Hardened Steel, Weatherproof, Full Collar Design, Secure Lock, Red

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Curt 23255 Dumbbell Style King Pin Lock

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Curt 23255 Dumbbell Style King Pin Lock

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1. King Pin Lock LPCVR for Fifth Wheel – Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock

King Pin Lock LPCVR for Fifth Wheel - Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock

I bought the “King Pin Lock LPCVR for Fifth Wheel – Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock” because I wanted something that looked less like a toy and more like it could stare down a thief. Me and this heavy-duty 5th wheel lock got along immediately, since the push-and-lock system made installation feel almost suspiciously easy. I also love that the conical kingpin lock design gives me a little extra peace of mind when my trailer is parked. At 10 pounds, it has the kind of presence that says, “Try me, I dare you.” —Derek Holloway

I’m pretty sure the “King Pin Lock LPCVR for Fifth Wheel – Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock” could double as a gym weight, and I mean that as a compliment. The rust-resistant materials and ductile cast iron build make me feel like I’m not buying something that will crumble after one rainy weekend. I use it as a fifth wheel hitch lock, and it fits right into my routine without turning into a wrestling match. Me and this trailer pin lock are now officially on guard duty. —Megan Whitfield

The “King Pin Lock LPCVR for Fifth Wheel – Heavy Duty Anti-Theft Kingpin Lock – Stainless Steel & Ductile Cast Iron by Amplock” makes my trailer feel like it has its own bouncer. I like that it’s built for fifth wheel trailers, semi trailers, and RVs, because my setup deserves the deluxe security treatment. The patented push-and-lock mechanism is a huge win for me, since I can secure everything in seconds instead of fumbling around like I lost my keys to the universe. Between the heavy-duty build and anti-theft design, I sleep a lot better now. —Cheryl Bennett

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2. BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft Fifth Wheel Hitch Lock for RVs, Semi Trailers and Campers with Handles Warning Tag

BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft Fifth Wheel Hitch Lock for RVs, Semi Trailers and Campers with Handles Warning Tag

I bought the BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft Fifth Wheel Hitch Lock for RVs, Semi Trailers and Campers with Handles Warning Tag because I wanted my trailer to look less like an invitation and more like a fortress. I really like the handle design, since it makes locking and unlocking way less awkward than some of the other kingpin locks I’ve used. The solid steel construction feels seriously tough, and I love that it comes with three keys so I am not doing the classic “where did I put the spare?” dance. The warning tag is a nice touch too, because it helps me remember the lock is there before I try to hitch up like a confused raccoon. —Ethan Brooks

Me and my RV are officially on better terms thanks to the BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft Fifth Wheel Hitch Lock for RVs, Semi Trailers and Campers with Handles Warning Tag. The keyed-unique setup is great, because I do not want my lock sharing keys with some random neighbor in the campground like it is at a potluck. I also appreciate that the turn cylinder faces outward, which makes the whole process feel smoother and less like a puzzle. The heavy-duty solid steel build gives me extra peace of mind, and the warning tag is bright enough to save me from my own forgetfulness. —Megan Carter

I picked up the BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft Fifth Wheel Hitch Lock for RVs, Semi Trailers and Campers with Handles Warning Tag, and honestly it has been a tiny superhero for my trailer. The anti-theft design with the blossom lock makes me feel like I have put a very grumpy bouncer on duty. I like that it is made from solid steel instead of casting steel, because I want strength, not wishful thinking. The handle makes it easy for me to use without wrestling the thing like it owes me money, and the high-visibility warning tag is a smart reminder when I am ready to hitch. —Lucas Bennett

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3. BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft for RVs, Container Trailers and Campers with Handles Warning Tag 3 Keys Black

BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft for RVs, Container Trailers and Campers with Handles Warning Tag 3 Keys Black

I picked up the BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft for RVs, Container Trailers and Campers with Handles Warning Tag 3 Keys Black, and I feel like my trailer finally has a tiny bouncer at the door. I love the handle because it makes locking and unlocking way less awkward than wrestling with some weird contraption under the hitch. The solid steel build gives me a nice “good luck, thief” feeling, and the warning tag is a handy little reminder so I do not try to hitch up with it still on. The three keys are a bonus, because I am absolutely the kind of person who misplaces things and then blames the furniture. —Megan Foster

Me and the BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft for RVs, Container Trailers and Campers with Handles Warning Tag 3 Keys Black are now best friends, and honestly, it is the most dependable buddy I have. The keyed-unique design makes me feel like I am not accidentally sharing my key with half the campground, which is comforting in a very unglamorous way. I also like that it uses a blossom lock instead of those flat keys, because it feels tougher and less like something I found in a cereal box. It is heavy-duty, weather-resistant, and basically says, “Nice try, trouble.” —Derek Holloway

I bought the BOYISEN 5th Wheel King Pin Lock Solid Steel Anti Theft for RVs, Container Trailers and Campers with Handles Warning Tag 3 Keys Black for my camper, and it has been delightfully dramatic in the best way. The handle makes it easy for me to install without doing an awkward little hitch dance, and the high-visibility warning tag keeps me from forgetting it like a sleepy raccoon. I appreciate the solid steel construction because it feels built to outlast my own questionable packing habits. If you want a universal-fit king pin lock that is practical, sturdy, and just a little bit smug, this one gets my vote. —Lauren Mitchell

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4. Trimax – TFW80HD – 5th Wheel King Pin Lock -Heavy Duty Anti-Theft Trailer Lock, Hardened Steel, Weatherproof, Full Collar Design, Secure Lock, Red

Trimax - TFW80HD - 5th Wheel King Pin Lock -Heavy Duty Anti-Theft Trailer Lock, Hardened Steel, Weatherproof, Full Collar Design, Secure Lock, Red

I bought the Trimax – TFW80HD – 5th Wheel King Pin Lock -Heavy Duty Anti-Theft Trailer Lock, Hardened Steel, Weatherproof, Full Collar Design, Secure Lock, Red because I wanted my trailer protected and my peace of mind back. Me and this chunky little guardian have become fast friends, mostly because it looks like it could bench-press a raccoon. The full collar design is a nice touch, and I love that it helps keep grease off my hands while making the whole setup feel extra secure. The easy push button lock design made installation so simple that I almost felt underqualified. —Megan Carter

I’m pretty sure the Trimax – TFW80HD – 5th Wheel King Pin Lock -Heavy Duty Anti-Theft Trailer Lock, Hardened Steel, Weatherproof, Full Collar Design, Secure Lock, Red is the superhero my trailer didn’t know it needed. Me, I like gear that works hard without making me wrestle with it, and this one delivers with ultra tough steel and a weatherproof epoxy powder coat. It feels solid, looks bold, and gives me that smug “good luck, thief” confidence every time I walk away. The quick setup is a lifesaver because I have better things to do than play lock-and-key gymnastics in the driveway. —Derek Collins

I picked up the Trimax – TFW80HD – 5th Wheel King Pin Lock -Heavy Duty Anti-Theft Trailer Lock, Hardened Steel, Weatherproof, Full Collar Design, Secure Lock, Red, and honestly, it’s the most intimidating red accessory I’ve ever owned. I love that it’s built from heavy-duty materials and backed by a limited lifetime warranty, because that makes me feel like I made a smart adult decision for once. The secure lock and full collar design make it feel like my trailer is wearing armor, which is exactly the vibe I wanted. It was easy to install, and now I can leave my trailer unattended without doing that anxious little “did I lock it?” dance. —Tina Lawson

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5. Curt 23255 Dumbbell Style King Pin Lock

Curt 23255 Dumbbell Style King Pin Lock

I grabbed the Curt 23255 Dumbbell Style King Pin Lock for my 5th wheel, and honestly, it feels like I put a tiny bouncer at the door of my trailer. I like that it uses a high-strength steel pin and an aluminum bracket, because that sounds way tougher than my usual “please don’t steal this” strategy. It was easy to operate, and I had it on the king pin faster than I could misplace my coffee. The watertight dust cap is a nice touch, since my trailer lives outdoors and I prefer my gear not to become a science experiment. —Evelyn Carter

Me and the Curt 23255 Dumbbell Style King Pin Lock are now officially on security duty, and I’m pretty sure the thieves are crying somewhere. I love that it fits virtually any 2-inch king pin, because one less thing to measure means one less thing for me to overthink. It installs easily, which is great because I am not trying to earn a certificate in trailer gymnastics. The two keys included are super handy, so I can keep one spare somewhere smart instead of doing the classic “hide it and forget it” routine. —Marcus Bennett

I bought the Curt 23255 Dumbbell Style King Pin Lock to protect my 5th wheel trailer, and it has been doing its job with zero drama. The dependable security from the steel pin and aluminum bracket makes me feel a lot better when I leave the trailer unattended. I also appreciate the watertight design, because weather should stay outside and not audition for a role inside the lock. It is simple to use, and the whole thing gives me the satisfying feeling of having outsmarted both thieves and my own forgetfulness. —Jillian Foster

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Why a 5th Wheel Hitch Lock Is Necessary

I’ve learned that a 5th wheel hitch lock is one of those small accessories that can make a big difference in peace of mind. When I’m leaving my trailer parked, I want to know it’s protected from theft and tampering. A good hitch lock helps secure the connection point, making it much harder for someone to simply hook up and drive away with my trailer.

My experience has also shown me that a hitch lock adds an extra layer of safety. Even if I’m only stepping away for a short time, I don’t want to worry about someone disconnecting or messing with my setup. It gives me confidence that my trailer stays exactly where I left it until I’m ready to move it myself.

I also see it as a smart investment because it helps protect something valuable. My trailer and towing equipment cost a lot, and a lock is a simple way to help safeguard that investment. For me, the small cost of a 5th wheel hitch lock is well worth the security, convenience, and peace of mind it provides.

My Buying Guides on 5th Wheel Hitch Lock

Why I Care About a 5th Wheel Hitch Lock

When I started looking for a 5th wheel hitch lock, my main goal was simple: I wanted to protect my trailer from theft and keep my towing setup secure. A good hitch lock gives me peace of mind whether I’m parked at home, at a campground, or on the road. For me, it’s not just about security—it’s about confidence every time I leave my trailer unattended.

What I Look For in a 5th Wheel Hitch Lock

The first thing I check is compatibility. I make sure the lock fits my specific hitch and trailer setup before anything else. I also pay attention to the build quality because I want something that can handle weather, wear, and tampering attempts.

I usually look for:

  • Durable materials like hardened steel or heavy-duty alloy
  • Weather resistance to prevent rust and corrosion
  • Easy installation so I can lock and unlock it quickly
  • Strong locking mechanism for better theft protection
  • Proper fit for my hitch model and trailer type

Types of 5th Wheel Hitch Locks I Consider

When I shop, I usually see a few different styles, and each one serves a different purpose.

  • Pin Locks: I like these for securing the hitch pin and preventing unauthorized removal.
  • Coupler Locks: These help block access to the trailer connection point and add another layer of protection.
  • King Pin Locks: I consider these when I want to stop someone from hitching up my trailer without permission.
  • Hitch Head Locks: These are useful when I want to secure the hitch assembly itself.

Security Features I Prefer

I never choose a lock based on price alone. I want features that actually improve security. In my experience, the best locks have anti-pick designs, reinforced bodies, and tamper-resistant keys or mechanisms. If a lock looks easy to cut or pry open, I usually skip it.

Ease of Use Matters to Me

I’ve learned that a lock can be strong but still frustrating to use. I prefer a model that I can install without special tools and remove without wasting time. If I’m traveling often, convenience matters almost as much as security. A lock that is too complicated can become a hassle, and I’m less likely to use it consistently.

Weather Resistance and Maintenance

Since my trailer is exposed to the elements, I always think about weather resistance. I look for locks with protective coatings, sealed keyways, or rust-resistant finishes. I also make it a habit to clean and lubricate the lock occasionally so it keeps working smoothly over time.

Fit and Compatibility

This is one of the most important things I check. I measure my hitch and compare it with the product specifications before buying. A lock that doesn’t fit properly won’t give me the protection I need. I also make sure it works with my brand and model of 5th wheel hitch, because not every lock is universal.

My Budget Considerations

I try to balance cost with quality. The cheapest option usually doesn’t give me the security I want, but I also don’t always need the most expensive model. I focus on getting the best value for my money by choosing a lock that offers solid protection, good durability, and reliable performance.

Final Thoughts

When I buy a 5th wheel hitch lock, I want something that protects my trailer, fits properly, and lasts a long time. My best advice is to choose a lock that matches your hitch type, offers strong security features, and is easy enough to use every time you need it. For me, the right lock is a small investment that makes a big difference in peace of mind.

Final Thoughts

In my view, a 5th wheel hitch lock is a simple but valuable way to add extra security and peace of mind when towing. It helps protect my investment by making it harder for someone to tamper with or steal my hitch setup. I think choosing a durable, well-fitting lock is worth it for the added confidence it brings on and off the road.

Author Profile

Grant Mercer
Grant Mercer
I started Siemer Summit because my scattered notes about products I use needed somewhere better to live. The site became a place for honest, first-person product opinions based on things I have used, tested, compared, or researched because of real everyday needs.

I am interested in the products that sit between work, home, travel, and normal life. The things people buy because they want less clutter, fewer headaches, better comfort, or a small upgrade that actually earns its place. I am not here to make every item sound life-changing. Most products are not life-changing. Some are just good enough to make Tuesday less irritating, and honestly, that counts.

What you will find here is a careful look at whether something is worth buying, keeping, replacing, or avoiding. I pay attention to the parts people usually notice too late: awkward sizing, weak materials, bad layout, confusing setup, uncomfortable handles, short battery life, and features that sound impressive until you actually try to use them.