10 Best Fifth Wheel King Pin Locks Of 2026: Secure RVs, Campers, And Trailers

If you park an RV, camper, or trailer unattended, a reliable fifth wheel king pin lock adds an important layer of theft deterrence. The best options are simple to install, highly visible, and built from tough steel.

Below, we focus on practical choices that balance strength, fit, and ease of use so you can choose with confidence.

Best 10 Fifth Wheel King Pin Lock Picks for 2026

Convenience-Focused Choice – BOYISEN 5th Wheel King Pin Lock with Handle

If you want a fifth wheel king pin lock that is easier to handle during daily use, this BOYISEN model stands out for its added handle and outward-facing cylinder. It is built from solid steel for theft resistance and includes a bright warning tag so the lock is easier to notice when you are ready to hitch up again.

Best For: RV owners, campers, and fleet users who want a more convenient lock to install, remove, and keep visible.

Pros:

• Handle and outward-facing cylinder make locking and unlocking more convenient.
• Solid steel construction is designed for weather resistance and added break-in resistance.
• Includes a bright warning tag plus 3 keys for backup access.
• Keyed unique design helps reduce the chance of matching keys between owners.

Cons:

• Heavier than lighter aluminum-style locks at 2.2 pounds.
• Best suited to users who value convenience and visibility over a simpler low-profile design.

Overall, this is a practical fifth wheel king pin lock if you want sturdy steel protection with extra day-to-day convenience. The warning tag and handle are useful touches for frequent hitching and unhitching.

Low-Profile Security Pick – Curt 23255 Dumbbell Style King Pin Lock

The Curt 23255 is a straightforward fifth wheel king pin lock aimed at universal fit and dependable theft deterrence. Its aluminum body and chrome-plated, powder-coated finish make it a simple option for owners who want a basic security layer without extra bulk.

Best For: Users who want a universal, lightweight king pin lock with a clean, no-fuss design.

Pros:

• Universal design fits most 5th wheel trailer kingpins.
• Strong aluminum body keeps the lock lightweight.
• Chrome-plated and powder-coated finish adds protection.
• Includes two keys for convenience.

Cons:

• Aluminum construction is not as heavy-duty as solid steel alternatives.
• Less feature-rich than models with handles or warning tags.

This is a solid pick if you prefer a simple, familiar design and want a lightweight lock that fits most kingpins. It focuses on basic deterrence rather than extra convenience features.

Heavy-Duty Deterrent – Heavy-Duty King Pin Lock with Caution Tag

This fifth wheel king pin lock is built for users who want a tough steel security option with strong visual deterrence. It uses durable steel, includes a bright yellow caution tag, and adds a handle for easier carrying and handling when you move it on and off the trailer.

Best For: RV, trailer, and camper owners who want a heavy-duty lock with a strong theft-deterrent look.

Pros:

• Tough steel construction is designed for strong security.
• Bright yellow caution tag helps deter thieves before they try.
• Attached handle makes the lock easier to carry and handle.

Cons:

• At 1.9 kg, it is heavier than lighter aluminum options.
• Includes fewer listed accessories than some other king pin locks.

In practical terms, this model is a good fit if you want your fifth wheel king pin lock to look serious and feel substantial. The steel build and bright tag make it a straightforward anti-theft choice.

Fleet-Grade Option – Buyers Products KPL200 Steel King Pin Lock

The Buyers Products KPL200 is a cast steel fifth wheel king pin lock designed for securing gooseneck and fifth wheel trailers with 2-inch king pins. Its oversize housing is meant to prevent mistaken coupling, making it a practical pick for work-focused trailer setups.

Best For: Users who need a durable, steel king pin lock for 2-inch king pins and utility trailer security.

Pros:

• Durable cast steel construction supports dependable security.
• Oversize housing helps prevent mistaken coupling.
• Designed for gooseneck and fifth wheel trailers with 2-inch king pins.
• Includes 2 keys.

Cons:

• Heavier than some alternatives at 3.2 pounds.
• More utilitarian than feature-added designs with handles or warning tags.

This is a good no-nonsense option for trailer owners who prioritize fit and durable steel construction. The oversize housing is a useful detail if mistaken coupling is a concern in your setup.

Budget-Friendly Security Pick – 5th Wheel King Pin Lock with Warning Tag

If you need a practical fifth wheel king pin lock for RVs, semi trailers, or campers, this model focuses on straightforward theft deterrence and easy day-to-day use. It includes a bright warning tag, a 12-inch chain, and a heavy-duty alloy steel body with a corrosion-resistant coating.

Best For: RV owners and camper haulers who want a simple, universal king pin lock with a clear visual warning.

Pros:

• High-strength iron construction with double-layer electrophoretic paint for weather and rust resistance
• Includes a 12-inch chain and bright red warning label to help prevent accidental hitch-up
• Easy to install and remove, with two keys included
• Precision anti-theft design covers the main pin to help resist drills and saws

Cons:

• Single lock only, so there is no backup unit included
• Warning tag is English-only according to the notes
• Best suited to standard king pin applications rather than specialty setups

This is a solid no-frills option if your priority is visible deterrence and basic trailer security. Its compact build and universal fit make it a convenient choice for frequent RV travel.

Heavy-Duty Premium Option – VULCAN Chromed Steel King Pin Lock

The VULCAN king pin trailer hitch lock is built for buyers who want a robust fifth wheel king pin lock with serious tamper resistance. Its solid steel cuff covers the king pin to stop connection to a 5th wheel, and the chrome-style finish is made to hold up to the elements.

Best For: RV and class 8 trailer owners who want a highly visible, heavy-duty theft deterrent.

Pros:

• Solid steel cuff and forged locking pin for strong tamper resistance
• Prevents the trailer from mating with a 5th wheel while engaged
• High-gloss stainless steel finish resists weather and wear
• Includes a fluorescent warning tag on a 12-inch chain plus two keys

Cons:

• Heavier than some compact alternatives at 2.42 pounds
• May be more lock than casual users need if they want basic deterrence only
• Designed around king pin security, so it is not a general-purpose coupler lock

For trailer owners who want a more serious barrier and a lock that looks the part, this VULCAN model stands out. It combines visibility, durability, and a covered king pin design in one straightforward package.

Easy-Use Value Choice – Orange 5th Wheel King Pin Lock

This fifth wheel king pin lock keeps things simple with a bright orange body, a fluorescent warning tag, and a straightforward locking process. It is built from heavy-duty steel copper with welded construction and an electrostatically treated surface for weather and rust resistance.

Best For: RVs, trucks, boats, and trailers that need an easy-to-see anti-theft lock with broad pin compatibility.

Pros:

• Bright yellow-orange design and fluorescent tag provide strong visual warning
• Heavy-duty welded steel copper construction with weather-resistant finish
• Simple lock-and-turn operation, with two keys included
• Designed for 50mm trailer pins and a range of uses including semi-trailers and containers

Cons:

• Each lock has its own key, so different units do not share keys
• Visibility is a strength, but it does not add extra access features beyond the lock itself
• Best fit is tied to the stated pin diameter, so check your dimensions first

If you want a practical king pin lock that is easy to spot and easy to operate, this one is a good fit. Its broad application range and warning tag make it a sensible choice for everyday trailer security.

Ultra-Tough Theft Deterrent – VULCAN Forged Steel King Pin Lock

If you want a fifth wheel king pin lock that focuses on brute-force deterrence, this VULCAN model is built to keep a trailer from mating with the 5th wheel in the first place. The forged steel body covers the entire king pin, and the bright orange finish plus warning ribbon help make it obvious that the trailer is secured.

Best For: RV and Class 8 trailer owners who want a heavy-duty visual and physical deterrent.

Pros:

• Heavy duty forged steel construction covers the entire king pin
• Bright orange powder coat and ribbon create a strong visual warning
• Slide bolt lock includes two keys
• Designed to resist tampering and the elements

Cons:

• Single-unit lock, so it is not aimed at fleet-style multiple-key setups
• Heavier than simpler deterrent locks at 2.5 pounds

Overall, this is a straightforward, industrial-style king pin lock for buyers who prioritize visible deterrence and forged-steel security. It is especially practical if you want a lock that is hard to ignore and easy to recognize from a distance.

Fleet-Friendly Keyed Alike Pick – 12-Pack Keyed Alike King Pin Locks

For buyers shopping for a fifth wheel king pin lock in bulk, this 12-pack stands out for its keyed-alike setup and simple no-tools operation. Each lock is made from a single piece of steel, powder-coated for durability, and paired with an orange safety ribbon for visibility.

Best For: RV dealers, trucking companies, or fleet drivers who need multiple matching locks.

Pros:

• Pack of 12 is ideal for multi-vehicle or fleet use
• Keyed alike design simplifies key management
• Single-piece steel construction with powder-coated finish
• No tools required; just slide in and turn the key

Cons:

• Bulk pack may be more than a solo RV owner needs
• Specific fit details are broader than a single-model specialty lock

This is a practical pick when consistency and convenience matter more than buying one lock at a time. The keyed-alike approach makes it easier to manage security across a group of trailers or RVs.

High-Visibility Security Choice – Yellow Heavy Duty King Pin Lock

This fifth wheel king pin lock is built around visibility, universal fit, and straightforward use. The bright yellow body and fluorescent warning tag are meant to discourage theft before it starts, while the heavy-duty steel construction and weather-resistant finish add confidence for long-term outdoor use.

Best For: Owners of 5th wheel trailers, semi trailers, RVs, or containers who want a bright, easy-to-use lock.

Pros:

• Bright yellow finish and warning tag act as a strong deterrent
• Universal fit for 50 mm diameter trailer pins
• Heavy duty steel construction with weather- and rust-resistant surface treatment
• Simple lock-and-key operation

Cons:

• Each lock uses its own keys, so it is not keyed alike
• Heavier than smaller basic locks at 1.08 kg

If you want a lock that is easy to spot and easy to use, this model checks both boxes. It suits buyers who value a universal fit and strong visual warning as part of their theft-prevention strategy.

How We Picked These Fifth Wheel King Pin Locks

We looked for locks that are straightforward to use, made from durable steel, and designed to visibly discourage theft. We also favored options with warning tags, solid construction, and compatibility with common RV, camper, and semi-trailer king pins.

Because fit matters, we paid attention to products that are clearly positioned for fifth wheel applications rather than generic hitch accessories. Ease of installation and day-to-day handling also mattered, especially for owners who secure and unsecure their rigs often.

Quick Comparison: What Matters Most

The main differences among a Fifth Wheel King Pin Lock usually come down to material, locking style, visibility, and intended use. Some are compact and simple, while others emphasize heavier steel construction or a more obvious deterrent presence.

If you want quick convenience, look for a design that installs fast and stores easily. If theft deterrence is your priority, choose a heavier, highly visible model with a strong warning tag and a shape that clearly blocks the king pin.

Key Buying Factors for a Fifth Wheel King Pin Lock

Material and Build Quality

Steel construction is the standard for a reason. A good Fifth Wheel King Pin Lock should resist casual tampering and feel substantial enough to discourage opportunistic theft.

Visibility

Bright colors and warning tags are more than cosmetic. A highly visible lock tells would-be thieves the trailer is protected, which can be just as important as the physical barrier itself.

Fit and Compatibility

Make sure the lock is intended for your style of king pin and trailer. Most buyers should confirm compatibility with RVs, campers, 5th wheel trailers, or Class 8 trailers before ordering.

Locking Method and Convenience

Some owners prefer a simple, fast setup for frequent use, while others want maximum deterrence and do not mind a slightly bulkier design. If you move your trailer often, convenience may matter as much as raw strength.

Who Should Buy Which Fifth Wheel King Pin Lock?

If you want a straightforward deterrent for seasonal RV storage, a standard steel Fifth Wheel King Pin Lock is usually enough. For high-value rigs or frequent outdoor parking, choose a heavier-duty model with strong visual deterrence and a robust build.

Owners managing multiple trailers may benefit from keyed-alike options, while commercial users should prioritize fit, toughness, and a lock style suited to regular yard or lot security. In every case, the best Fifth Wheel King Pin Lock is the one that matches your trailer, storage habits, and security needs.