1. Gooseneck Trailer Coupler
  2. Bulldog
  3. Coupler with Outer and Inner Tube
  4. 30000 lbs GTW
  5. Round Tube
  6. 2-5/16 Inch Gooseneck Ball
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 Trailer Coupler
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Shipping Weight: 47 lbs
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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. Call 800-298-8924 to order Bulldog gooseneck trailer coupler part number BD1289040300 or order online at etrailer.com. 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 Trailer Coupler reviews from real customers.
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  • Reviews (157)
  • Q & A (5)
  • Videos (1)
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  • Why etrailer?

Bulldog Gooseneck Trailer Coupler - BD1289040300

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

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

BD1289040300 Installation InstructionsInstallation Details BD1289040300 Installation instructions

California residents: click here

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Bulldog BX1 Gooseneck Coupler Review

Randy: Hey guys its Randy Hurdy, trailer.com. Today we're taking a look at a Gooseneck Coupler from Bulldog. This is the BX1 line. Now this is available as just the coupler insert or also with the outer tube, so you've got good options there. This is the long version, this coupler's gonna work out really well for your two wheeled drive trucks, your lowering trucks, any truck that sits a little bit lower to the ground. Once you get into bigger four wheel drive trucks, big F350's, 3500's or you get into lifted trucks you want to go with a short coupler.Now the latching mechanism here is really unique to this coupler.

It has a position here, it goes in, it locks in that place. We've got our nice, wide, rounded area here to help guide that Gooseneck bolt up an end. Once that's up and end, we just want to pull around the handle and pull rearward and place it in like that. I think this gives us a better grip, so if our trailer is pushed a little further forward, it gives us enough power or enough grip to be able to pull hard enough to get it latched into place there.Now the coupler is going to be serviceable in two locations as well. One's in our pivot handle, we've got a greaser grate down here.

The other's going to be over on our hinge. That keeps everything lubricated nicely and that paired with the already oil impregnated bushings that they use, means we should have years of great service out of this.We're also going to have a hole right here. We can run a lock down through there and that'll prevent anybody from disconnecting the coupler from the ball. Now as far as weight capacities go, there are several available, you just want to ensure that you pick one that matches what your load's going to be and what your trailer's rated for. It's okay to go over.

A Gooseneck that's overbuilt isn't going to necessarily take away from the performance of your trailer, but you certainly wouldn't want to go under your weight rating.The BX1 coupler's in the outer tube are all going to be unfinished when you receive them. This is going to allow you to paint it much more easily to match your trailer and also get it welded on easier, you won't have to grind off any of the old paint. All of the warning labels you can see, they've got a protective cover over them so once you paint it, you can peel that off and all your labels will look really nice.All in all, I really like this coupler, I like the design of the handle. I think that's going to be a little bit easier to use, than some of them that we have available out there. It's going to do a good job, it's going to connect easy with that place.

If I we're putting one on my trailer I think I would go with one that auto-connects, so as you're lowering your trailer down, it automatically latches. That saves you having to get up in the back of the truck but you've got to remember you've got safety chains and wiring that you still have to connect, so if you're going to be in the truck for that anyway, this would be a great way to connect your trailer to your truck.Now your installation process, of course that's going to depend on whether you're getting the outer tube with your coupler or not. If you are getting the outer tube, let's take a look at the front of the trailer here. This is going to be replaced whether you've damaged it, maybe the weld's have broke loose, whatever the situation is, or maybe you're building a new trailer, this is going to added on right to the front. You can see these are usually about the same size, about 20 inches or so outer tube diameter.This one happens to have two set bolts rather than the one that we more typically see, just a little bit more security. Well that's going to be welded on here and placed on so you can then add your coupler into it, paint it down and get it secure. The one thing we highly recommend, the tops on all these are always open, so what we recommend, just like they do in a factory set-up like what we've got here, you're going to weld on a steel plate, you want to cap that off, that prevents moisture from getting down in there, causing the outer tube and the inner tube to rust together.And once our outer tube is set, we'll bring our coupler, just slide that up and in and we'll slide our pin through. The pin's going to be provided. I like having that, this gives us a new fresh set to slide through. Now the bottom of your coupler as you set it, we've got four holes there to pick from so it gives us the eight inches of adjustment. You want the bottom side of the coupler here to most closely match what you had, or if you're trying to level your truck, or if you could just put on a new outer tube, you want to position this so that your trailer sits nice and level when couple.Next we'll have our set bolt, that needs to be run down to where it makes contact with our coupler, then we'll need to torque that down properly. Once that's done, we can get a little jam nut here and run that jam nut down, both of these are going to use an inch and an eighth wrench. That's most typical. So we're going to apply a little bit of torque to that, that'll prevent this bold from loosing up. At that point our coupler's going to be ready for use.That's going to complete our look at the BX1 line from Bulldog.

Customer Reviews

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

Average Customer Rating:  4.9 out of 5 stars   (157 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.

- BD1289040300

Everything arrived good looks good 634238

- BD1289040300

Bulldog bx1 coupler is best thing on our trailer since new tires! Easy to use, easy and massless to grease and latch feels effortless! 49379

- BD1289040300

easy and showed up quick. we are in the process of making something new so don't have pictures yet. 177399

- BD1289040300

Very easy to use site, product arrived on time, will recommend them to others. 404114

- BD1289040300

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! 601291

- BD1289040300

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. 733328

- BD1289040300

Worked great. Was easy to weld in and love the latch system 726663

- BD1289040300

Looks great and super fast shipping. Th anks. 713730

- BD1289040300

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. 625649

- BD1289040300

worked great, thanks 616564

- BD1289040300

YEAH!!!!!! 553279

- BD1289040300

Great quality exactly what I needed. Super fast shipping. 491892

- BD1289040300

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. 478555

- BD1289040300

Best coupler I've ever used. Planning on changing my other couplers out with this one. 463090

- BD1289040300

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. 437695

- BD1289040300

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! 409204

- BD1289040300

Great product prompt shipping great pri ce 408625

- BD1289040300

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. 318863

- BD1289040300

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. 276054

- BD1289040300

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!!! 240883

- BD1289040300

Very nice hitch. I would recommend this style hitch over older style. 100% easier to use 220825

- BD1289040300

Love the new coupling. Nice upgrade over the 40 year old original. Easy to weld in and works great. 184007

- BD1289040300


- BD1289210300

Review from a similar Bulldog BX1 in Gooseneck Trailer Coupler

Did it job work great 472300

- BD1289210300

Review from a similar Bulldog BX1 in Gooseneck Trailer Coupler

Would not have been able to use trailer without it truck was to tall. Tons of misalignment is allowed for hooking up. If etrailer was smart they would sell the pin to lock the latch with the receiver. Can't use standard hardware because clearance is tight. Has to be the correct oddball Lynch pin. If they do sell it, make it like other sites 'customers frequently bought with this...' 436956

Show More Reviews

Ask the Experts about this Bulldog Gooseneck Trailer Coupler

  • 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...
    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 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...
  • 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...
  • 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...

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Info for this part was:

Written by:
Lindsey S
Expert Research:
Michael H
Updated by:
Laura H
Updated by:
Alexander C
Updated by:
Isabelle B
Video Edited:
Dustin K
Installed by:
Randy B
Video by:
Zach D

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