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Bulldog BX1 Round Gooseneck Trailer Coupler 25,000 lbs 4" Inner Tube Only Adjustable 2‑5/16" Hitch Ball
Model: 1289020300 'BX1™ 25K Round Gooseneck Coupler (Inner Tube Only), Includes Locking Pin Assembly, 4 Hole Adjustment and Labels
The BULLDOG BX1 coupler is the result of generations of design expertise and field experience. It incorporates innovative features that revolutionize the benefits available from a gooseneck coupler.
• Makes hooking up, adjusting vertical height, and disconnecting easy
• Maintains smooth operation over time with grease fittings for every important operating part
• Operates easily with one hand thanks to new locking handle design
• Continuous tight ball fit - ever-increasing cam tightening mechanism
• Protects against wear with enclosed locking pin mechanism
• Resists theft with integrated feature to allow pad-locking the coupler to the ball (lock not included)
• Guides ball into socket more easily—letting you miss by more than an inch—with bottom locking plate 50% larger than competitors
• Lengthens life of locking mechanism with oil-impregnated bushings
• Allows shorter retracted length and less wasted length for trucks with high bed height via low-profile locking mechanism
• Fits ball better and reduces jarring through contour-formed edge on bottom locking plate
• Delivers unmatched strength through heavy-duty construction
• Innovations that improve security, service life, and functionality
• New ball pocket design provides contact on both sides of the ball for substantially improved pull out strength - the only sliding-plate design that transfers part of the load to the top locking plate rather than only the bottom locking plate
| Part Number | 1289020300 |
| Brand | Bulldog |
| Capacity | 25,000 lbs. |
| Retracted Height | 28.5" |
| Extended Height | N/A |
| Range of Adjustment | 8" (when used w/ outer tube) |
| Ball SIze | 2-5/16" |
| Inner Tube Diameter | 4" |
| Warranty | 5 Year |
| Installation Instructions |  |
About Bulldog
This part is a perfect choice for your Cattle horse Livestock and other trailers made by manufacturers like Big Tex Kaufman PJ ATC Gatormade Anderson Load Trail GN WITZCO Wells Cargo Barret Red Rhino Middlebury Elite Lark Snake River Load N Go and many more
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Product Details
- Brand: Bulldog
- Model: 1289020300 '
- UPC: 016118112375
- Includes: Round Gooseneck Coupler
BX1™ 25K Round Gooseneck Coupler (Inner Tube Only), Includes Locking Pin Assembly, 4 Hole Adjustment and Labels
The BULLDOG BX1 coupler is the result of generations of design expertise and field experience. It incorporates innovative features that revolutionize the benefits available from a gooseneck coupler.
• Makes hooking up, adjusting vertical height, and disconnecting easy
• Maintains smooth operation over time with grease fittings for every important operating part
• Operates easily with one hand thanks to new locking handle design
• Continuous tight ball fit - ever-increasing cam tightening mechanism
• Protects against wear with enclosed locking pin mechanism
• Resists theft with integrated feature to allow pad-locking the coupler to the ball (lock not included)
• Guides ball into socket more easily—letting you miss by more than an inch—with bottom locking plate 50% larger than competitors
• Lengthens life of locking mechanism with oil-impregnated bushings
• Allows shorter retracted length and less wasted length for trucks with high bed height via low-profile locking mechanism
• Fits ball better and reduces jarring through contour-formed edge on bottom locking plate
• Delivers unmatched strength through heavy-duty construction
• Innovations that improve security, service life, and functionality
• New ball pocket design provides contact on both sides of the ball for substantially improved pull out strength - the only sliding-plate design that transfers part of the load to the top locking plate rather than only the bottom locking plate
| Part Number | 1289020300 |
| Brand | Bulldog |
| Capacity | 25,000 lbs. |
| Retracted Height | 28.5" |
| Extended Height | N/A |
| Range of Adjustment | 8" (when used w/ outer tube) |
| Ball SIze | 2-5/16" |
| Inner Tube Diameter | 4" |
| Warranty | 5 Year |
| Installation Instructions | |
About Bulldog
This part is a perfect choice for your Cattle horse Livestock and other trailers made by manufacturers like Big Tex Kaufman PJ ATC Gatormade Anderson Load Trail GN WITZCO Wells Cargo Barret Red Rhino Middlebury Elite Lark Snake River Load N Go and many more
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Bulldog BX1 Round Gooseneck Trailer Coupler 25,000 lbs 4" Inner Tube Only Adjustable 2-5/16" Hitch Ball Install Notes
Installation and Maintenance Instructions for BX1 Gooseneck Coupler
Specifications:
- Rated according to SAE J2638 standards.
- Requires a 2 5/16” hitch ball rated equal to or greater than the coupler’s capacity.
- Maximum extension: 8 inches from the fully retracted position.
Tools Required:
- Torque wrench capable of 125 ft-lbs.
- AWS-certified welder (for welding tasks).
- Hammer and 5/32" punch (for handle repair kit).
Safety Notes:
- Do not exceed the coupler, hitch, vehicle, ball, or trailer weight ratings, including the load.
- Never position any body part under the product or the load it supports.
- Secure the load, vehicle, and trailer by blocking wheels before latching or unlatching the coupler.
- Inspect all components for signs of wear or damage before towing.
- Replace bent, broken, or worn parts before use.
- Ensure the hitch ball is fully seated in the coupler ball pocket and the latch is closed.
- Use safety chains and ensure trailer lighting complies with regulations.
- Do not exceed 8" of extension beyond the coupler’s fully retracted position.
Installation Instructions:
Pre-Installation:
- Confirm no interference from the tow vehicle, tongue, ground, or mounted accessories during operation.
- Ensure set bolts face the towing vehicle.
- Attach gussets as low as possible to support the outer tube.
- Avoid heat damage to the coupler during welding.
- All welding must be performed by an AWS-certified welder.
- After welding, confirm the coupler remains vertical for proper operation.
Welding:
- Rigidly attach the outer tube to the trailer to support the rated load.
- Do not weld over or near holes or hardware on the coupler.
Post-Installation:
- Tighten set bolts and jam nuts to minimize vibrations.
- Ensure labels are applied and pre-mask tape is removed after painting.
- Confirm that the coupler operation has not been impaired.
Operating Instructions:
To Couple:
- Block trailer wheels.
- Align the hitch ball beneath the coupler.
- Open the coupler by lifting the handle and sliding the locking plate into position.
- Lower the trailer onto the hitch ball and ensure it is fully seated.
- Close the coupler by sliding the locking plate and lowering the handle.
- Insert a theft deterrent lock (optional).
To Uncouple:
- Block trailer wheels.
- Remove the lock (if installed) and open the coupler handle.
- Slide the locking plate into the open position and raise the trailer from the hitch ball.
Maintenance:
- Perform the following at least annually:
- Check hardware torque (125 ft-lbs).
- Grease the ball pocket and fittings.
- Inspect the retaining pin and replace if necessary.
- Keep the ball pocket, latch, and handle clean.
Warranty Information:
- Limited Five-Year Warranty:
- Covers material and workmanship defects.
- Exclusions:
- Normal wear and tear.
- Damage from misuse, overloading, or improper installation.
- Alterations made outside provided instructions.
- Claims:
- Retain the purchase receipt for warranty claims.
- Refer to the full product manual for warranty claim instructions.
Additional Notes:
- Gussets must extend to within 3” of the bottom of the outer tube for rated load support.
- Handle repair kits are available and include necessary components (handle assembly, locking cam, groove pin, bushing, and torsion spring).
- Replacement parts are available through authorized retailers or distributors.
Attention: This is a summary of the installation procedure. For complete instructions, including diagrams and detailed information, please download the full installation PDF or contact your distributor.
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