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  1. Gooseneck Coupler
  2. Bulldog
  3. Round Tube
  4. Coupler with Outer and Inner Tube
  5. 30000 lbs GTW
  6. Manual Latch
Bulldog BX1 Gooseneck Coupler - Adjustable Height - Round - 2-5/16" Ball - 30,000 lbs

Bulldog BX1 Gooseneck Coupler - Adjustable Height - Round - 2-5/16" Ball - 30,000 lbs

Item # BD1289040300
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Gooseneck Coupler
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Shipping Weight: 47 lbs
BD1289040300 - 30000 lbs GTW Bulldog Gooseneck Coupler
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Gooseneck coupler offers 8" of vertical adjustment. Large locking plate makes hookup fast and easy. Ball pocket contacts ball on both sides for tight fit with less rattle. Grease fittings simplify maintenance. 24-1/2" Retracted height. 1-800-940-8924 to order Bulldog gooseneck coupler part number BD1289040300 or order online at Free expert support on all Bulldog products. Guaranteed Lowest Price and Fastest Shipping for Bulldog BX1 Gooseneck Coupler - Adjustable Height - Round - 2-5/16" Ball - 30,000 lbs. Gooseneck Coupler reviews from real customers.
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  • Reviews (234)
  • Q & A (0)
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  • Why etrailer?

Bulldog Gooseneck Coupler - BD1289040300

  • Round Tube
  • Coupler with Outer and Inner Tube
  • 30000 lbs GTW
  • Manual Latch
  • Bulldog
  • 2-5/16 Inch Gooseneck Ball

Gooseneck coupler offers 8" of vertical adjustment. Large locking plate makes hookup fast and easy. Ball pocket contacts ball on both sides for tight fit with less rattle. Grease fittings simplify maintenance. 24-1/2" Retracted height.


  • Gooseneck coupler is strong, durable and easy to use
  • Oversize funnel makes it easy to guide ball into socket
    • Bottom locking plate is 50 percent larger than competition
    • Coupler engages even if you miss the ball by just over an inch
  • Tight ball fit helps to reduce jarring and rattling
    • Ball pocket provides contact on both sides of ball
  • One-handed operation with easy-to-use handle
    • Lockable with padlock (sold separately)
    • Oil-impregnated bushings increase life of locking mechanism
  • Low-profile design is great for high-bed trucks
    • Allows for shorter retracted height
  • Smooth operation over time
    • Integrated grease fittings throughout make for simple maintenance
  • Superior, high-strength steel has raw finish for welding


  • Ball size: 2-5/16"
  • Retracted height: 24-1/2"
  • Range of vertical adjustment: 8"
  • Inner tube diameter: 4"
  • Weight capacity: 30,000 lbs
  • Limited 5-year warranty

The BX1 gooseneck coupler from Bulldog is designed to provide the easiest, most secure hookup possible. The bottom locking plate on this coupler is 50 percent larger than the competition, providing additional surface area to guide the ball into the socket. Miss the target by just over an inch and the coupler will still engage.

Bulldog BX1 Gooseneck Coupler Locking Plate

Once hookup is complete, use the easy-to-access, easy-to-maneuver handle to lock the coupler to the ball. When the handle is down, you know that everything is secure and it's okay to tow. For extra security you can insert a padlock (sold separately) through the fixed plate.

Once you begin towing, you may notice that there is far less rattle and jarring at the coupled point than you'd experience with a standard gooseneck coupler. This is because the ball pocket on the BX1 provides contact on both sides of the hitch ball, rather than on only one side, which is typical of the competition. The result is a tight fit around the ball that makes for a smoother, quieter and more secure towing experience.

1289040300 Bulldog BX1 Gooseneck Trailer Coupler - 30,000 lbs

Installation Details BD1289040300 Installation instructions

California residents: click here

Customer Reviews

Bulldog BX1 Gooseneck Coupler - Adjustable Height - Round - 2-5/16" Ball - 30,000 lbs - BD1289040300

Average Customer Rating:  4.8 out of 5 stars   (234 Customer Reviews)

Gooseneck coupler offers 8" of vertical adjustment. Large locking plate makes hookup fast and easy. Ball pocket contacts ball on both sides for tight fit with less rattle. Grease fittings simplify maintenance. 24-1/2" Retracted height.


I had a fixed neck on my 32' cattle trailer and with the newer trucks the ball sits so high that my front axle on the trailer was barely touching the ground. After replacing the fixed hitch with the bx1 my trailer rides level. It does exactly what I was hoping it would do!! GREAT PRODUCT!!!


Excellent product and service. I replaced the hitch on my 36 ft PJ due to hole ripping out. I made a modification to the hitch to reinforce the hole as shown in pictures.


It was just right


Worked great. Was easy to weld in and love the latch system


I bought a 2017 Ford F250 which was higher than my 2011. I replaced a different bulldog hitch with this on my cattle trailer and was able to get more adjustment to completely level my trailer. I actually only used the insert. I really like the lock! The cupped design also makes it easy to go on the ball. I got a great product at a great price! Thanks guys!


This hitch worked out very well in lieu of buying a Ranch hand style for my 5th wheel RV trailer. This hitch was easy to use and more to the point we now use these on our fabricated flatbed trailers as well.


Great product. I bought and installed this hitch 1 year ago and have had zero problems. I did not use the outside tube portion for my set up, instead I welded the inside portion directly to my trailer as I did not require an adjustable set up. I personally am very happy with the latch mechanism. Quick and easy to hookup.


Excellent quality, and the cupped end of the coupler makes it extraordinarily easy to hitch up even when alighnment isn't perfect.
Used it to replace the oem coupler on a used trailer and gain more clearance between tongue and bed. Perfect choice.


Came home from work to the package on my front step after 6 days, opened it like a kid on Christmas and was more than happy with the product. As heavy duty as you can make it for a great price. It's going to work perfect on my 30ft horse trailer and my lifted pickem up truck.


Very nice hitch. I would recommend this style hitch over older style. 100% easier to use


This coupler honestly exceeded our expectations! My husband was extremely impressed with it and we will be buying these couplers in the future for trailers we purchase. They are heavy duty and I can't believe the low price for the quality of product! Very satisfied customer and will definitely buy from etrailer in the future!


Bulldog bx1 coupler is best thing on our trailer since new tires! Easy to use, easy and massless to grease and latch feels effortless!


Best coupler I've ever used. Planning on changing my other couplers out with this one.




Love the new coupling. Nice upgrade over the 40 year old original. Easy to weld in and works great.


Great quality exactly what I needed. Super fast shipping.


Nice coupler!




Order was processed and delivered quickly. Exceeding my delivery expectations for ground. Continuous follow up on the order. Savings was great. Definitely will be back.


Very easy to use site, product arrived on time, will recommend them to others.


worked great, thanks





easy and showed up quick. we are in the process of making something new so don't have pictures yet.


Show More Reviews

See what our Experts say about this Bulldog Gooseneck Coupler

  • What Is the Outside Diameter of the Bulldog BX1 Gooseneck Coupler
    The outer diameter of the outer tube on the Bulldog BX1 Gooseneck Coupler part # BD1289040300 is 4-1/2". The length of the outer tube is 20". The outer diameter of the inner tube is 4". I don't have accesses to any of the mechanical drawing but if you need another measurement not listed above just let me know what that is.
    view full answer...
  • Round Gooseneck Coupler Rated For 30,000 Lbs
    Since your setup is only are strong as it's weakest component you could not add the Bulldog BX1 Gooseneck Coupler Inner Tube - Round part # BD1289050300 to your outer tube and increase the capacity. If you need a 30,000 lb capacity gooseneck coupler, I recommend Bulldog BX1 Gooseneck Coupler - Adjustable Height - Round - 2-5/16" Ball - 30,000 lbs part # BD1289040300.
    view full answer...
  • Replacement Bulldog 30k BX1 Gooseneck Coupler Recommendation for Trailer
    I have a better solution for you, but I can't really recommend you start drilling holes in your outer tube as that could potentially reduce the trailer's capacity and would most likely void some warranties. A better solution would be for you to remove your current outer tube and then install the # BD1289040300 instead as that would allow you to use the same style coupler as the inner tube that you referenced.
    view full answer...
  • Replacement Gooseneck Coupler with Outside Diameter of 4-1/2 inches
    You will want to make sure that the inside diameter of 4 inches is the same, but the Bulldog BX1 Gooseneck Coupler # BD1289040300 has an outside diameter of 4-1/2 inches and will fit the standard gooseneck ball size of 2-5/16 inches. It is rated for 30,000 lbs, has a retracted height of 24-1/2 inches and has a vertical range adjustment of 8 inches. This gooseneck coupler also comes with a Limited 5-Year Warranty.
    view full answer...
  • Towing a 5th Wheel Trailer with a Gooseneck Hitch in a 2011 GMC Sierra
    It sounds like your truck has a gooseneck hitch and your trailer has a 5th wheel king pin. In order to tow a 5th wheel trailer using a gooseneck hitch you will need an adapter. I recommend the Andersen Ranch Hitch # AM3100. I have included a link to a video review of this adapter for you.
    view full answer...
  • Replacement Inner Gooseneck Trailer Coupler Tube that Doesnt Use Load Bearing Pins
    As far as an inner tube only, the BX1 coupler # BD1289170300 is the only option. It sounds like you need one that is held in the outer tube with set screws such as # CG or # BD0287690300. Coupler # CG has a 4 inch diameter tube and # BD0287690300 has a 4-1/2 inch tube. The other option is to replace both the outer and inner tube with # BD1289040300, # BD1289030300, # BD1289000300, # BD1289080300, # BD1289070300, or # BD1289140300. These are all BX1 couplers for 2-5/16 inch balls and...
    view full answer...

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Info for this part was:

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Expert Research:
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Updated by:
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Employee Isabelle B
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Employee Dustin K
Video Edited:
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