The 7 Best Gooseneck Trailer Locks in the US (2026)
The best gooseneck trailer lock in the US for 2026 is the AMPLock Bulldog Coupler Lock (GNB), a coupler lock made from ductile iron and stainless steel with a patented disk-lock design. The right lock depends on your coupler brand and whether you want to secure the trailer coupler or the truck-bed receiving tube, so this guide covers both coupler locks and tube locks across 7 gooseneck picks.
To rank the 7 best gooseneck trailer locks below, we weighed material grade, coupler compatibility, locking mechanism, weather resistance, and warranty coverage.
Best Overall
Bulldog
The AMPLock Bulldog Coupler Lock is machined from ductile iron and stainless steel and molded to fit Bulldog gooseneck coupler profiles precisely, closing the gaps that let pry tools get purchase. It pushes closed without a key, then locks with a patented disk-lock cylinder rated for millions of key combinations. Rubber gaskets keep moisture and road salt out through Canadian winters.
What we like
Proven Industries Gooseneck Coupler Lock GRB-78
The Proven Industries GRB-78 uses hardened steel internals inside a zinc-plated housing built to fit both Ram and Bulldog gooseneck couplers tightly. A mounting pin comes included, and the housing doubles as a cover for the coupler's safety chains, keeping them from being lifted off the ball. It is manufactured in the USA and sold widely through trailer retailers across Canada.
What we like
Blaylock American Metal Gooseneck Coupler Lock TL-50
The Blaylock TL-50 pairs a lightweight aircraft-grade aluminum housing with a 3/4-inch hardened steel locking rod, and it fits any 2-5/16-inch gooseneck coupler, including Bulldog, T.E.M., TEMCO, and Hammerblow/Cequent profiles. Two adjustable pin positions accommodate different coupler shapes. A padlock is not included, so buyers need to add their own for it to function.
What we like
Atwood
Built on the same ductile iron and stainless steel platform as the Bulldog lock, the AMPLock Atwood-Style Coupler Lock is precision-molded for Atwood gooseneck and flat-nose coupler profiles instead. It shares the push-and-lock closing action and the patented disk-lock cylinder, so owners with mixed trailer fleets can standardize on one key across coupler types.
What we like
Best Value
Gooseneck Hitch Tube
Rather than clamping the coupler itself, the AMPLock Gooseneck Hitch Tube Lock blocks the receiving tube in the truck bed so no coupler can be inserted at all. Built from the same ductile iron and stainless steel as AMPLock's coupler locks, it uses the same push-and-lock disk-lock cylinder. At roughly $178, it is AMPLock's most affordable gooseneck option and works well as a second layer alongside a coupler lock.
What we like
GanderLock Gooseneck Trailer Lock
The GanderLock Gooseneck Trailer Lock is a 5-pound solid-steel tube lock, built to order in Texas, that blocks the truck bed's receiving tube in 4-inch round, 4-inch square, or 4.5-inch square configurations. It installs in under five minutes and is available in keyed sets for fleets running multiple trucks.
What we like
Toughest Build
Ft. Knox Locks Original Gooseneck Lock
The Ft. Knox Locks Original Gooseneck Lock is welded from 3/16-inch cold-rolled steel with fully welded hinges, giving it one of the toughest builds in this category. It ships with Trimax puck locks featuring a concealed, downward-facing keyway, and buyers can upgrade to an Abloy Sentry cylinder. The bright yellow powder coat finish is made in the USA and easy to spot at a glance.
What we like
How to Choose the Right Gooseneck Trailer Lock
Gooseneck trailers spend long stretches parked at job sites, storage lots, and driveways across the US, often unattended overnight. A lock rated for that exposure needs to match the coupler on the trailer, hold up to salt and freeze-thaw cycles, and use a mechanism that resists picking rather than just deterring casual theft. The right choice depends on what part of the connection needs protecting and how the trailer is used day to day.
Coupler Lock vs. Tube Lock: What Each One Actually Secures
A coupler lock clamps directly onto the trailer's gooseneck coupler, blocking the latch mechanism so the coupler cannot be opened or lifted off a ball, even one belonging to a different truck. A tube lock works on the opposite end of the connection: it blocks the receiving tube in the truck bed itself, so no coupler, stolen or otherwise, can be inserted at all. Many trailer owners run both. A coupler lock stops someone from hitching up with their own truck, while a tube lock stops a thief who already has a lock-pick set from simply swapping trucks. Used together, as with an AMPLock coupler lock and hitch tube lock pair, they cover both ends of the connection independently.
Material Grade and Construction
Lock bodies in this category fall into a few groups: ductile iron and stainless steel, hardened steel, aircraft-grade aluminum, and zinc-plated alloy. Ductile iron resists shattering under impact better than cast iron, while stainless components resist the corrosion that road salt and de-icing chemicals cause over a harsh winter. Solid hardened-steel builds add raw weight and cutting resistance at the cost of being heavier to handle. Aircraft aluminum trims weight but relies more heavily on its internal steel locking rod for actual strength. Zinc-plated housings are common on mid-range locks and hold up reasonably well provided the plating itself is not compromised early through scratching or chipping.
Locking Mechanism and Coupler Compatibility
Two things matter here: the cylinder itself, and whether the lock actually fits the coupler in question. Disk-lock cylinders, used across AMPLock's heavy-duty trailer lock line, offer a high number of key combinations and resist picking better than simple pin-tumbler designs. Puck-style locks, often supplied with welded steel bodies, depend on the puck's own pick resistance and how well the keyway is shielded from weather and tampering. Some locks are sold without a padlock at all, which shifts that decision, and its cost, onto the buyer. Compatibility matters just as much as mechanism quality. Bulldog, Ram, Atwood, T.E.M., TEMCO, and Hammerblow/Cequent couplers all use different profiles, and a lock built for one can sit loose or fail to seat properly on another; a loose fit gives a thief more leverage, not less. Buyers running more than one trailer often standardize on a keyed-alike system so a single key operates every lock in the fleet, which matters in the US, where locks get used in gloved hands during cold months and a fumbled key search in a parking lot is its own liability. Weather sealing, in the form of gaskets or a fully enclosed housing, keeps moisture out of the cylinder so it does not freeze or corrode shut over a winter of use.
Get the Best Gooseneck Trailer Lock at AMPLock
AMPLock builds its Bulldog, Atwood-Style, and Gooseneck Hitch Tube locks from ductile iron and stainless steel, matched to real coupler profiles instead of a one-size-fits-all shape. Every AMPLock gooseneck lock uses the same push-and-lock disk-lock cylinder and keyed-alike system, so trailers and tow vehicles across a fleet can run on a single key.
Every purchase includes a 5-year warranty, free shipping across the US, and 30-day returns. Browse the full lineup at amplock.com and lock down your gooseneck trailer the right way.
Frequently Asked Questions About Gooseneck Trailer Locks
What size gooseneck lock fits my coupler?
Gooseneck couplers are not one size. Bulldog, Atwood, Ram, T.E.M., TEMCO, and Hammerblow/Cequent all use different profiles, and a lock cut for one can sit loose on another. Check the coupler brand before buying, and favour a lock built for that exact profile over a generic universal fit, since a loose fit gives a thief more leverage.
Are coupler locks better than tube locks?
Neither replaces the other; they protect different points. A coupler lock blocks the trailer's coupler from being opened or lifted off a ball. A tube lock blocks the truck bed's receiving tube so no coupler can be inserted at all. Many owners across the US run both for independent protection at each end of the connection.
How do you install a gooseneck trailer lock?
Most coupler locks close over the coupler's latch mechanism by hand, need no tools, and lock with a push-and-lock motion or a supplied padlock. Tube locks insert into the truck bed's receiving tube and typically take under five minutes. Confirm the coupler or tube dimensions first to make sure the lock will fit before installing.
Can you use one key for multiple gooseneck locks?
Yes, keyed-alike systems let one key operate several locks. AMPLock's coupler and hitch tube locks share a keyed-alike design, so a single key can work across a fleet's trailers and trucks. This matters in the US, where fumbling for the right key in cold weather with gloves on is a real inconvenience.
How much does a gooseneck trailer lock cost?
Prices in the US range from roughly $100 USD for a basic tube lock up to $300 USD or more for a premium coupler lock with a high-security cylinder. Mid-range hardened-steel and aluminum coupler locks typically fall between those figures, with price tracking material grade and cylinder quality more than brand alone.
