The 7 Best Gooseneck Trailer Locks in the USA (2026)

The best gooseneck trailer lock in 2026 is the AMPLock Bulldog Coupler Lock (GNB), a coupler lock made from ductile iron and stainless steel with a patented disk lock design.

But the right pick depends on your trailer's coupler type, your security priorities, and your budget.This guide compares 7 of the best gooseneck trailer locks available in the USA, including 3 AMPLock models and 4 competitors.

Each lock was evaluated on material grade, coupler compatibility, locking mechanism, weather resistance, and warranty coverage.

1. AMPLock: Bulldog Coupler Lock (GNB)

AMPLock's Bulldog Coupler Lock (GNB) is a gooseneck coupler lock built from ductile iron and stainless steel, CNC-machined in North America to fit Bulldog coupler profiles. It’s The push-and-lock system secures the coupler without a key, and the patented disk lock cylinder uses millions of unique combinations to resist picking. At 3 lbs, this lock balances heavy-duty security with daily usability.

Why Choose This Lock

• Custom-fit for Bulldog gooseneck couplers: CNC-machined from ductile iron and stainless steel to match Bulldog coupler profiles exactly.
• Push-and-lock system: No key needed to lock. Push the lock into place and walk away. The disk locking cylinder activates only when unlocking.
• Patented disk lock cylinder: Millions of unique combinations secure the coupler against picking and forced entry. Exclusive key control prevents unauthorized duplication.
• Heavy-duty construction: Made from high-grade ductile iron and stainless steel, CNC-machined in North America by AMPDrummond Inc. (precision machining since 1992).
• Weather-resistant design: Rubber gaskets seal the lock cylinder and component joints to prevent water ingress during year-round outdoor storage.
• Lightweight at 3 lbs: Owners describe this product as easy to install and remove, even for daily use on a gooseneck trailer.
• Keyed-alike option: One key works across your entire AMPLock lineup, from gooseneck coupler locks to ball hitch models.
• Strong warranty backing: 5-year warranty, free shipping, and 30-day free returns. Quality backed by a family-owned company.

2. Proven Industries: Gooseneck Coupler Lock Model GRB-78

The Proven Industries GRB-78 is a hardened steel gooseneck coupler lock designed to fit Ram and Bulldog coupler profiles with a tight, glove-like seal. Made in the USA with zinc-plated construction, this lock includes a mounting pin and secures safety chains inside the lock housing.

Why Choose This Lock

• Hardened steel locking parts: Internal components are constructed from hardened steel for increased security against cutting and prying tools.
• Custom-tailored coupler fit: Designed as a "glove-like" fit specifically for Ram and Bulldog gooseneck couplers, leaving minimal gaps for attack.
• Safety chain security: One of the few gooseneck coupler locks that also secures your safety chains inside the lock housing.
• Zinc-plated construction: Exterior coating protects the steel body from corrosion during outdoor storage.
• Pin included for installation: Ships with the mounting pin needed to lock onto the coupler, no extra hardware required.
• Made in the USA: Designed and manufactured domestically by Proven Industries.
• Positive owner feedback: Reviews highlight the tight fit, heavy-duty build, and durable key cylinder design.

3. Blaylock American Metal: Gooseneck Style Coupler Lock TL-50

The Blaylock TL-50 is an aircraft-grade aluminum gooseneck coupler lock with a 3/4" hardened steel locking rod. It fits all gooseneck 2-5/16" style couplers and features an adjustable 2-pin placement for a customized fit. The padlock is not included and sold separately.

Why Choose This Lock

• Aircraft-grade aluminum construction: Precision-made from high-grade aircraft aluminum that resists corrosion and won't rust during outdoor storage.
• Hardened steel locking pin: 3/4" solid steel rod secures the coupler and resists cutting tools.
• Wide coupler compatibility: Fits all gooseneck 2-5/16" style couplers, including Bulldog, T.E.M., TEMCO, and Hammerblow/Cequent brands.
• Adjustable 2-pin placement: Two pin positions let you customize the fit for a tighter lock on your specific coupler design.
• Patented design: Slides over the coupler bracket and covers the latch mechanism to prevent unauthorized release.
• Widely available: Sold at Home Depot, Camping World, etrailer, and Walmart for convenient purchasing.
• Made in the USA: Crafted domestically by Blaylock American Metal.

4. AMPLock: Atwood-Style Coupler Lock

AMPLock's Atwood-Style Coupler Lock is a gooseneck coupler lock built from the same ductile iron and stainless steel construction as the Bulldog model, precision-molded to fit Atwood gooseneck and flat nose coupler profiles. The disk lock cylinder and push-and-lock system deliver the same security standard across a different coupler type.

Why Choose This Lock

• Precision-molded for Atwood couplers: Custom-fit design matches Atwood gooseneck and flat nose coupler profiles with no wobble or loosening.
• Same construction as the Bulldog model: Ductile iron and stainless steel body, CNC-machined to the same quality standard as AMPLock's flagship gooseneck lock.
• Disk lock cylinder with millions of unique combinations: Rotating disc mechanism resists picking, cutting, drilling, and freezing.
• Push-and-lock system: Secure the coupler without a key. Push into place and the lock engages automatically.
• Keyed-alike compatible: Use the same key across your full AMPLock lineup for gooseneck, ball coupler, and barn door locks.
• Strong warranty and returns: 5-year warranty, free shipping, and 30-day free returns from a family-owned manufacturer made in North America.

5. AMPLock: Gooseneck Hitch Tube Lock

AMPLock's Gooseneck Hitch Tube Lock takes a different approach to gooseneck trailer security by blocking the receiving tube in the truck bed so no coupler can be inserted. Built from ductile iron and stainless steel, this tube lock uses the same push-and-lock system found across AMPLock's gooseneck lineup.

Why Choose This Lock

• Blocks the receiving tube entirely: Fits inside the gooseneck hitch tube in the truck bed, preventing any coupler from being inserted. Thieves can't hook up if there's no access point.
• Different security approach: Protects the truck-side connection instead of the trailer-side coupler, giving owners a second layer of defense when paired with a coupler lock.
• Ductile iron and stainless steel construction: Same heavy-duty materials as AMPLock's coupler locks, built to resist cutting, prying, and corrosion.
• Push-and-lock design: Secure the hitch tube without a key. The lock engages on contact and only requires the key to remove.
• Patented locking cylinder: Disk lock mechanism with millions of unique combinations resists picking, drilling, and forced entry.
• Keyed-alike option: Use the same key across all AMPLock gooseneck locks for a unified security system.
• Most affordable AMPLock gooseneck lock: At $178, it's the lowest-priced option in AMPLock's gooseneck lineup while using the same fit and build quality.

6. GanderLock: Gooseneck Trailer Lock

The GanderLock is a 5 lb steel tube lock that blocks the receiving tube opening to prevent coupler insertion. Built to order in Texas by inventor Mark Cline, this lock was born from real-world theft experience after Cline had 2 gooseneck trailers stolen over 20 years.

Why Choose This Lock

• 5 lbs of solid steel: Heavy steel body blocks the receiving tube opening entirely, preventing any coupler from being inserted.
• Built-to-order construction: Each lock is individually manufactured in Texas, designed to fit 4" round, 4" square, and 4.5" square gooseneck tube sizes.
• Inventor-driven design: Created by Mark Cline after having 2 gooseneck trailers stolen over 20 years. The lock was born from real-world theft experience, not a product lab.
• Resists forced entry: Heavy-duty materials withstand cutting, drilling, and prying attempts, making it difficult for thieves to tow your trailer.
• Keyed lock sets for fleets: Multiple locks can share the same key, which is useful for ranchers and fleet operators who secure several gooseneck trailers.
• Quick installation: Takes less than 5 minutes to drop the coupler and slide the GanderLock into place to protect your trailer.
• Free shipping: Ships free across the USA.

7. Ft. Knox Locks: Original Gooseneck Lock

The Ft. Knox Original Gooseneck Lock is a heavy-duty welded steel lock with 3/16" cold-rolled construction, fully welded hinges, and Trimax puck locks included as standard. An optional Abloy Sentry stainless steel cylinder upgrade offers top-tier key security. Family-run, made in the USA.

Why Choose This Lock

• 3/16" welded cold-rolled steel construction: Fully welded body with welded hinges and hinge pins resists bolt cutters, crowbars, and hammer attacks.
• Square tube and round tube versions: Separate models for each gooseneck tube type give you a precise, secure fit on your specific coupler.
• Trimax puck locks included: Ships with concealed-shackle puck locks that hide the keyway from direct attack. Downward-facing design adds another layer of security.
• Abloy Sentry upgrade available: Optional stainless steel Abloy Sentry cylinder offers top-tier picking and drilling resistance for owners who want the highest key quality.
• Bright yellow powder coat finish: High-visibility color acts as a strong visual deterrent, signaling to thieves that the gooseneck trailer is locked down.
• Patented design: Patents granted on the lock housing and latch mechanism, confirming the uniqueness of the engineering.
• Family-run, made in the USA: Small-batch production by a family-owned business with free FedEx/UPS shipping on all US orders.

How To Choose The Right Gooseneck Trailer Lock For Your Trailer?

Finding the right gooseneck trailer lock starts with understanding the difference between a coupler lock and a tube lock, and what you need from each to secure your hitch. Material grade, coupler compatibility, locking mechanism type, and warranty coverage are the features that separate effective locks from those that fail under real pressure. Keep these factors in mind when choosing protection for your gooseneck, because the investment you make in a lock should match the value of what it secures. Look for locks that combine the right material grade with a locking mechanism built for your specific coupler type.

What Is The Difference Between A Gooseneck Coupler Lock And A Tube Lock?

Coupler locks clamp over the gooseneck ball coupler to keep the latch from being released or the ball from being hooked up. They secure the trailer-side connection. The AMPLock Bulldog, Proven Industries GRB-78, and Blaylock TL-50 are all coupler locks designed to fit specific coupler profiles. Tube locks take a different approach: they block the receiving hitch tube in the truck bed so no coupler can be inserted at all. The AMPLock Gooseneck Hitch Tube Lock and GanderLock fall into this category. Some owners use both types together for maximum coverage.

Why Material Grade And Construction Quality Matter

Material quality determines real-world resistance. Ductile iron absorbs impact without cracking, stainless steel prevents corrosion for year-round outdoor storage, and hardened steel (Proven Industries, Ft. Knox) resists bolt cutters and crowbars. Aircraft-grade aluminum, like the Blaylock TL-50, is lightweight but less resistant to cutting tools. Keep in mind that standard padlocks and zinc alloy construction can be defeated with basic hand tools in under a minute, which is why material choice matters more than price.

Gooseneck trailers haul heavy, high-value loads and represent a significant investment. Even as overall vehicle thefts fell 23% in 2025 to 659,880 units (NICB), trailer-specific theft remains a persistent problem. Locks made from premium materials cost more upfront but deliver years of protection. LockPickingLawyer described AMPLock's trailer locks as "one of the beefiest" he has reviewed, pointing to the quality gap between premium and budget alternatives.

What Locking Mechanism And Compatibility Features Matter For Gooseneck Locks?

Locking mechanism matters equally. Disk lock mechanisms (AMPLock) use rotating discs with millions of unique combinations, making the system virtually impossible to pick. Puck locks with concealed shackles (Ft. Knox) hide the keyway from direct attack. Padlock-based systems (Blaylock TL-50) depend entirely on the quality of the padlock you supply, and a weak padlock undermines an otherwise solid lock design. These are the features you need to compare before choosing.

Coupler compatibility is the final piece. Bulldog, Ram, Atwood, T.E.M., and TEMCO couplers all have different profiles, and a lock that doesn't fit offers zero protection. Always verify your coupler brand and style before purchasing. Keyed-alike options (AMPLock) let fleet owners use one key across multiple locks, and push-and-lock pin systems make the process easy enough that the lock gets used every time.

Get The Best Gooseneck Trailer Lock At AMPLock

Gooseneck trailers carry high-value loads, and the best way to protect them is with a lock that matches their value. Every product in AMPLock's gooseneck lineup is built from ductile iron and stainless steel, backed by a 5-year warranty, free shipping, and 30-day returns: the quality standard that keeps your trailer secure.

Browse the full range of Bulldog, Atwood, and Hitch Tube models in the gooseneck trailer locks collection. Contact the AMPLock team for help choosing the right lock for your trailer.

Frequently Asked Questions About Gooseneck Trailer Locks

What Size Gooseneck Trailer Lock Fits My Coupler?

The size of gooseneck trailer lock you need depends on your coupler brand and style. Bulldog, Ram, Atwood, T.E.M., and TEMCO couplers all have different profiles, so a lock built for one won't fit another. Always check the manufacturer's product page and compatibility chart before purchasing. Custom-fit locks are molded to match a specific coupler type, delivering a more precise fit than universal alternatives.

Can A Gooseneck Trailer Lock Prevent All Types Of Trailer Theft?

No single gooseneck trailer lock can prevent every type of theft. A coupler lock may stop thieves from hooking up to your trailer, but it won't protect against someone cutting the coupler itself. Pairing a coupler lock with a tube lock or wheel lock gives you layered protection that covers both the trailer-side and truck-side connections. The goal is to make your gooseneck trailer difficult enough to steal that thieves move on to an easier target, and a quality lock is the most effective way to secure that outcome.

Are Gooseneck Coupler Locks Better Than Tube Locks?

Coupler locks and tube locks secure different parts of the gooseneck connection, so one isn't strictly better than the other. Coupler locks clamp over the ball coupler to block hookup, while tube locks plug the receiving tube to prevent any coupler insertion. The better choice depends on your setup and how you use your trailer. Many owners combine both for a layered lock design that covers every access point.

How Do You Install A Gooseneck Trailer Lock?

Most gooseneck trailer locks are easy to install without tools. Coupler locks typically slide over the coupler and secure with a pin or locking system that clicks into place. Tube locks require you to remove the gooseneck coupler first, then slide the lock into the receiving tube. Push-and-lock systems (like AMPLock) make daily use simple: push the lock into the fit position and the locking mechanism engages automatically.

Can You Use One Key For Multiple Gooseneck Trailer Locks?

Some manufacturers offer keyed-alike systems that let you use one key for multiple gooseneck trailer locks. AMPLock's keyed-alike option works across their entire product lineup, so a single key can secure your Bulldog coupler lock, Atwood coupler lock, and Hitch Tube Lock. This system is especially useful for fleet operators who manage different trailers and don't want a separate key ring for each one.

Do Gooseneck Trailer Locks Work In All Weather Conditions?

High-quality gooseneck trailer locks with sealed cylinders and stainless steel components function in rain, snow, and extreme temperatures without jamming or corroding. Rubber gaskets and weather-resistant coatings prevent rust and keep the locking mechanism operating during year-round outdoor storage.

How Much Does A Gooseneck Trailer Lock Cost?

Gooseneck trailer locks range from about $100 for basic tube locks to over $300 for premium coupler locks with patented locking mechanisms and stainless steel construction. The price depends on the material grade, coupler compatibility, and locking system used.

Should You Use A Gooseneck Coupler Lock And A Tube Lock Together?

Combining a coupler lock with a tube lock covers both the trailer-side and truck-side connections, giving you layered security that is significantly harder for thieves to defeat. A coupler lock prevents hookup while a tube lock blocks access to the receiving hitch entirely, so using both together is the most complete approach to gooseneck trailer protection.