same day shipping on all orders placed before 2p EST!!

same day shipping on all orders placed before 2p EST!!

Shopping Cart

GBX Bulldog Gooseneck Coupler Lock Model 57

GBX Bulldog Gooseneck Coupler Lock Model 57


Show all (6) product images Show fewer product images

  • Show all (6) product images Show fewer product images

    GBX Bulldog Gooseneck Coupler Lock Model 57

    Regular price $290.00




    Having the best coupler locks is not an easy task. We pride ourselves on a glove-like fit security product and with that being said this will reduce the percentage of thieves that are capable of breaching our security products.

    Without high-quality locks, you can’t guard your utility trailers and personal possessions. Our GBX BullDog Gooseneck Coupler Lock is a secure, powerful lock designed to help you increase the security of your trailers. It’s constructed with alloy steel that protects against bolt cutters, saws, and other power tools and features a unique key design that prevents someone from creating a copy of your key. Help keep your possessions and work equipment safe with our incredible heavy-duty coupler lock.

    This custom-tailored trailer and RV lock is designed to fit only specific  BullDog gooseneck trailer couplers. This lock does not fit Ram couplers. Use our Ram gooseneck coupler lock with Ram couplers.

    Our secure trailer lock is easy to install and is made of 3 lock components: an inner slide, an exterior shield, and a puck lock. To install, place the inner slide around the coupler drop tube then engage the tab at the rear of the housing with the slot at the rear of the inner slide. Swing the outer housing around the drop tube, and install the puck lock over the exposed pin. Add this lock to your camper and travel-trailer accessories for durable protection of your belongings.

    *Please note, product pictures may not represent current model, as products are revised. We are constantly making minor adjustments based on customer feedback (we appreciate all the feedback). All locks are now upgraded to 7 pin tubular lock at no additional cost.

    Please contact us at with any questions.

    Lock Core

    Cobra 7 (Standard)

    The Cobra 7 is a patented key system that was developed for the high-security needs in the vending industries. The COBRA tubular keyway is like no other with its 7 sided tubular keyway, this unique feature stops anyone from going to a hardware store to copy your key. This product offers a high-security solution for those that are looking for excellent exterior performance. COBRA 7 comes standard in all of our products at no additional cost.


    The Cobra 7 system is geared for the business owner looking for a great performing lock system at an affordable price with key control.

    Proven Disk-Detainer (Upgrade Option)

    The Proven Disk Detainer Lock was developed for high-security situations where  minimum maintenance is not possible. This particular lock is virtually impossible to pick due to its rotating disk and requires special lock picks and skills needed in order to pick. 


    Disk detainer locks are not all that common in everyday use. Mainly this style of lock is reserved for high-end locks. These lock perform well in extreme weather conditions with minimum if any maintenance.


    Medeco M3 (Available upon request, for additional cost)

    Medeco comes as one of the oldest High-security lock manufacturers in the USA. You will find this high-security lock in most prisons, government facilities, and even the White House! This particular lock is virtually impossible to pick due to its rotating pins that not only need to be at the right height but the right rotation in order to unlock.


    Medeco is typically needed for the high-security needs of companies that need key control or grandmaster key solutions. All parts are machined out of brass and hardened steel, for the combination of great exterior performance and high-security needs.

    *Medeco and Abloy is available upon request for an additional fee. Please call customer support for additional information.

    ← Previous Product Next Product →

    Don't miss a thing

    Like our products? Sign up for news and updates.