bing tracking image
  1. Gooseneck and Fifth Wheel Adapters
  2. Bulldog
  3. Gooseneck Trailer to Fifth Wheel Hitch
  4. Replaces Inner and Outer Tubes
  5. Gooseneck Coupler Adapters
  6. 30000 lbs GTW
Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter - Square - 30,000 lbs

Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter - Square - 30,000 lbs

Item # BD0289590300
Retail:$485.04
Our Price: $293.12
You Save: $191.92
Gooseneck and Fifth Wheel Adapters
Shipping Weight: 68 lbs
Add to cart
In Stock
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

Customer Photos

Need help with installation?
Locate installers near me
Pull your gooseneck trailer with a fifth-wheel hitch by installing this square king pin adapter. Simply replace both the inner and outer tubes of the gooseneck with this unique coupler and you're ready to tow. 1-800-940-8924 to order Bulldog gooseneck and fifth wheel adapters part number BD0289590300 or order online at etrailer.com. Free expert support on all Bulldog products. Great prices and Fastest Shipping for Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter - Square - 30,000 lbs. Gooseneck and Fifth Wheel Adapters reviews from real customers.
  • All Info
  • Reviews (347)
  • Q & A (0)
  • Photos

Bulldog Gooseneck and Fifth Wheel Adapters - BD0289590300

  • Gooseneck Trailer to Fifth Wheel Hitch
  • Replaces Inner and Outer Tubes
  • Bulldog
  • Gooseneck Coupler Adapters
  • 30000 lbs GTW
  • No Offset
  • Adapts Trailer
  • Adjustable Height

Pull your gooseneck trailer with a fifth-wheel hitch by installing this square king pin adapter. Simply replace both the inner and outer tubes of the gooseneck with this unique coupler and you're ready to tow.


Features:

  • Gooseneck-to-5th-wheel adapter lets you tow your gooseneck trailer with a 5th-wheel hitch
  • Unique coupler fits the same as a gooseneck coupler with inner and outer tubes
  • Sturdy, load-bearing pinch bolt and 2 set bolts included
  • Durable steel construction with raw finish for welding
  • Adjustable to fit your application


Specs:

  • Retracted height: 23-1/3"
  • Extended height: 31-1/3"
  • Range of adjustment: 8"
  • Outer tube diameter: 4-1/2"
  • Inner tube diameter: 4"
  • Capacity: 30,000 lbs
  • Limited 3-year warranty


Dimensions of plate for gooseneck coupler

Note: This coupler replaces both the inner and the outer tubes. A professional will need to remove the original coupler and weld on the new coupler.



0289590300 Bulldog Kingpin to Gooseneck Adapter - Square




California residents: click here


Customer Satisfaction Score:


Customer Reviews

Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter - Square - 30,000 lbs - BD0289590300

Average Customer Rating:  4.7 out of 5 stars   (347 Customer Reviews)

Pull your gooseneck trailer with a fifth-wheel hitch by installing this square king pin adapter. Simply replace both the inner and outer tubes of the gooseneck with this unique coupler and you're ready to tow.

by:

It is as advertised. Heavy built. Great construction. Welds are burned in properly. I built a bumper pull to 5th wheel conversion for our camper and it worked great. I highly recommend.



by:

Would bot fit onto my big tex trailer!

Etrailer Expert

Katrina B.

12/21/2022

I am sorry to hear that this is not working for your application. Our customer service department will be getting in touch with you about a return label.



by:

Good product hooks on good to my truck and my semis trucks



by:

Excellent quality very well made fast delivery
Would buy again



by:

I am well pleased with the quality of this product. I used it when modifying my gooseneck to a fifth wheel.



by:

Product looks good, was delivered as promised. I specifically ordered the heavier unit for my trailer as the hitch is the weak point in the final connection.



by:



by: 07/14/2023



by:



by:



by:

I ordered the Bulldog adapter because I believe their quality is good. The construction of the Bulldog hitch adapter was good. However, the 4” tube was not perfectly round, approximately.030 out of round. This shouldn’t have been an issue, but since my trailer is used and had a Temco hitch originally, the tube wouldn’t slip in. I chucked the Bulldog in the lathe and skimmed .030 of the diameter and it went right in. This review is not written to criticize Etrailer or Bulldog. Just be aware if you’re working with a different brand hitch other than what is listed, there is a possibility of fitment issues.



by:

Perfect for the job if you’re switching from the regular gooseneck hookup to a semi truck fifth wheel set up. Shipping was accurate & I love my adapter! Very easy to attach & real neat finish to paint it whatever color you would like to.



by:

My expectation when I unboxed the unit was that it would be a brand new unit. This unit looks like it had been made up and peicemealed from random gooseneck parts. I am reluctant to use this unit because I am questioning the workmanship of the welds.



by:

the Bulldog was the perfect fit for our trailer. thank you for your dedicated service in getting the parts correct and them delivered promptly!



by:

Great product, fast shipping, excellent communication, definitely recommend these guys!!

We painted the square tube/king pin tube red and installed it. Works great, but there is not much of it to see in the pic. Take my word, well built & very heavy duty!!



by:

I ordered this product and received it 3 days later, I took about 1 hour to remove the gooseneck tube and install this one and get the height set for towing, removed it once again and painted it due to it being bare metal. So far this seems to be a quality product.



by:

I bought a used trailer and wanted to replace the gooseneck coupler and redesign the frame connection. I had a number of goals in this replacement.
1) Extend radius of the frame neck. Was 73in increased to 90in.
2) Move frame connection to a lower area of tube.
3) Increase surface area frame contacts tube and add collars to tube for increased surface area for cross tube pin.
4) Convert from gooseneck to fifth wheel style connection but allow revert back if wanted.
5. Add cover over top of tube to shed water from entering tube sections. (4in PVC pipe cap with a little dremel work fits great)
6. Replace safety chains with weld on chain mounts to frame. Allow chain replacement without welding chain to frame.
7. Provide covered area for safety chains and wiring to avoid weather.

After much welding and fitting the new tube and post insert are finished and painted. I am very pleased with the quality of the items from etrailer and will be placing more orders in the future for trailer parts.



by:

Great product. Very well built. I am a farmer and use it to hook up a goose neck trailer to our semi. We use the trailer to haul hay, machinery, or even cattle. What's great about this product is that you can move it from trailer to trailer. This adapter will fit in a gooseneck trailer with the pin running through the side or with the bolts on the front. Overall great product for the farm.



by:

Ordered on Friday afternoon and received the following Tuesday. Very simple installation. No longer have to crank the gooseneck up or down to connect to truck. Very satisfied with this product and the price was very reasonable.



by:

Bought this so my wife could load and unload our 30' flatbed easier. The gooseneck required her to climb into the bed and was hard for her to line up. This adapter installed in less than 60 seconds and has made her new career as a hot shot driver that much more enjoyable. I couldn't be more happier.



by:

Works great. Now I don’t have to use the tractor to pull the heavy B&W hitch with the pog system everytime I need to pull the gooseneck. I did have to drill the holes for the pin since the coupler was not a bulldog brand. Pulls better on the king pin than the gooseneck ball also.

Great price. Will shop again soon.



by:

I have ordered alot from etrailer and always been pleased , last week I ordered a 5th wheel conversion for my gooseneck trailer then went outside and literally cut my gooseneck hitch off , i then got a call from etrailer saying the part I ordered was backordered and was not available .while I was disappointed I was so glad called me immediately and was able to come up with a alternative . Great customer service ,I can not say enough great things about etrailer



by:

Worked like a charm, haul for a living and slides right in every circle gooseneck hitch. Only recommendation for company for buyers is to clear coat it because when not in use it will surface rust with in a couple days. Otherwise affordable quality buy!



by:

The adapter is really well built. The welds are great and the raw material was easy to paint. The problem I encountered was the fourth and lowest adjustment hole could not be reached due to the four pieces of triangular support stock hitting my Big Tex trailer neck tube before the hole would line up for the pin. So I had to take my cutoff wheel and trim 1/2” off those four pieces of triangular support metal so the adapter would go up further in the neck and the pin could be inserted. I hate working on new equipment but it’s easier than returning it and losing time.



by:

Worked perfect thought fitment might be an issue but it slid in perfect and gets the job done very satisfied especially considering the price would definitely recommend if switching from a gooseneck to a fifth wheel


25
347
Show More Reviews

See what our Experts say about this Bulldog Gooseneck and Fifth Wheel Adapters

  • What Is The Size Of The King Pin On The Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter?
    The Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter # BD0289590300 uses the standard 2" diameter king pin. This is generally used on 5th wheels outside of the commercial shipping, as they use a larger 3-1/2" king pin.
    view full answer...
  • Can a 2007 Kenworth Big Rig Truck Tow a Gooseneck Trailer
    There are several ways to adapt a trailer or 5th wheel hitch to tow a gooseneck trailer. But since the Kenworth is a large big rig type of truck the best option will be to use an adapter or adapters like the one you referenced # BD0289590300. You will just need to know the inner tube diameter, the shape, and if any of the trailers would need to have a different coupler welded on (like if one of the inner tubes only we carry would not fit). I have included a link to all of the adapters...
    view full answer...
  • Availability of Inner Tube Gooseneck to Fifth Wheel Adapter that Measures 4-1/2 inch by 4-1/2 inch
    I wish we did, but everything we carry has an inner square diameter of 4 inch by 4 inch. If the outer tube of your setup is 4-1/2 inch by 4-1/2 inch then the inner tube part # BD0289650300 could potentially be what you are looking for. You would need to measure the opening at the bottom of the outer tube though.
    view full answer...
  • What is the Exact Size of Bulldog Coupler Adapter # BD0289650300
    I went out and pulled one of these Bulldog Coupler Adapter # BD0289650300 and the measurements are as follows: the outside dimension of the adapter is an exact 4 inches. The inside dimension is an exact 3-7/16 inches. Another unit that we have that is a tad bit larger is the Bulldog # BD0289590300. This has an outside dimension of 4-1/2 inches and an inside dimension of 4 inches.
    view full answer...
  • Gooseneck Coupler to 5th Wheel Trailer Hitch Adapter Recommendation
    You have some options in converting the gooseneck coupler on the trailer to be used with a 5th wheel trailer hitch. But, there is not an adpater that will replace the inner tube of the Bulldog Gooseneck Coupler, # BD028900. What you can do is replace the whole assembly, inner and outer tube, with Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter, # BD0289590300. This coupler fits the trailer the same as a gooseneck coupler with inner and outer tubes. It is adjustable. The only feature...
    view full answer...
  • Availability of Gooseneck to 5th Wheel Hitch Adapter for 5 inch Square Outer Tube
    All the Gooseneck to Fifth Wheel hitch adapters we offer have a 4 inch square tube, and wouldn't be compatible with your existing 5 inch square outer tube. If you wanted to go with the more standard 4 inch square inner tubing coupler/adapter, you could remove your existing outer tube and use the outer tube of the # BD0289590300 in its place. If you needed to tow a gooseneck, you can use the Bulldog Coupler inner tube, # BD0288660300. This coupler would be compatible with the outer tube...
    view full answer...
  • Recommended 4-1/2 Inch Square Gooseneck-to-5th-Wheel Trailer Coupler Adapter
    We do carry an adapter that would let you tow your gooseneck trailer with a fifth wheel hitch. You would need to order part # BD0289590300. This is a square king pin adapter that has an outer tube diameter of 4-1/2 inches. The weight capacity is 30,000 lbs and has an 8 inch range of height adjustment of 23-1/3 to 31-1/3 inches. This coupler replaces both the inner and outer tubes on the gooseneck. This is a weld-on adapter and needs a professional to remove the original coupler and weld...
    view full answer...
  • 30,000 lb 5th Wheel Hitch Recommendation for a 2008 Dodge Ram 4500
    The Reese Low-Profile 5th Wheel Trailer Hitch, # RP30054, is the only fifth-wheel trailer hitch we carry at this time that is capable of towing up to 30,000 lbs total trailer weight. This hitch is compliant with V5 and SAE regulations when used within the limits set by the hitch manufacturer. This hitch has not been tested to meet DOT commercial regulations, and if used in a commercial application there may be warranty limits set by the manufacturer. You should also consult the owners manual...
    view full answer...
  • Gooseneck Coupler Recommendations for a Pace American Trailer with Gooseneck King Pin
    It sounds like you have something like the part # BD0289590300 on your trailer now and you are looking for a way to convert it to a gooseneck hitch that is designed to couple to a gooseneck ball. Which the only inner tube gooseneck hitch that would fit your square 4-1/2 inch outer tube would be the # BD1289210300. A better solution might be to completely remove what you have on your trailer and install an entire new assembly like part # BD0289500300.
    view full answer...
  • Is a Gooseneck to Fifth Wheel Adpater With Outer Tube Diameter of 4-1/2 Inches Available?
    There is a gooseneck to fifth wheel adapter with an outer tube diameter of 4-1/2 inches, the Bulldog # BD0289590300. This is a square tube, though there is also the Ram Gooseneck to 5th Wheel Trailer Coupler Adapter # KPG5-R25 which is a round tube with an outer tube dimension of 4-1/2 inches. I've added links to video reviews of these parts for you to take a look at.
    view full answer...
  • Recommended Square Tube Gooseneck to 5th Wheel King Pin Adapter
    It sounds like you have a gooseneck like the Atwood Gooseneck Trailer Coupler AT75401. For an adapter to kingpin, I recommend the Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter - Inner Tube - Square - 30,000 lbs # BD0289650300 or the # KPG5-Q25-IP. Both measure 4 inches outer diameter to fit inside a tube 4-1/2 inches outer diameter. Another option is to use the Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter - Square - 30,000 lbs # BD0289590300. This will only be needed...
    view full answer...
  • What is the Width of the Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter # BD0289650300
    The inside width of the Bulldog Gooseneck-to-5th-Wheel Trailer Coupler Adapter # BD0289650300 is 3-7/16" while the outside width is 4". If the inside width of your outer tube is about 3-1/2" then this coupler adapter won't fit. All of our other square inner tubes have the same 4" outer diameter. You may need to swap out your whole coupler for an option like part # BD0289590300 which is the whole adapter; inside and outside tubes. You can lock the king pin with part # e98896 and the inner...
    view full answer...
  • How to Tow Gooseneck Trailer With OEM Puck System on 2019 Chevy Silverado 2500
    Thank you for the information! We have 2 ways to accomplish this; you can either replace your current gooseneck coupler with an adapter piece like the Bulldog # BD0289590300, or you can use the Adapter Rails # C47BR with the Curt Above-Bed Gooseneck Trailer Hitch for Fifth Wheel Rails # 16055 to get a gooseneck hitch ball for your trailer to attach to. The former will be most cost-effective when it comes to purchasing the products but the latter will be a bit easier because you won't...
    view full answer...
  • Towing a Gooseneck Trailer with a 5th Wheel Trailer Hitch
    All of the replace inner square tube adapters that we carry like # KPG5-Q25-IP are 4 inches square. But there is an option none-the-less. You could replace the entire coupler, inner and outer tube, with something like # BD0289590300. Removal of the old coupler and installation of the new one is going to require a qualified professional with experience in this sort of job. If this is not an option for you I recommend a different sort of adapter, one that fits in the truck. If your 5th wheel...
    view full answer...
  • Adapter Solution to Convert Gooseneck Trailer to Fifth Wheel King Pin
    We have gooseneck trailer to fifth wheel king pin adapters that would work great on your trailer but it really depends on what type of gooseneck trailer you have now. For example if you have a square tube gooseneck you could use the part # BD028965030 or for a round tube part # PKG5-R25-IP. Or you could replace the outer tube as well and use the Bulldog # BD0289590300. For an air to electric brake controller the Hayes part # HA100400C is the kit you want. This ties into the air brake setup...
    view full answer...

Do you have a question about this Gooseneck and Fifth Wheel Adapter?


Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Rachael H
Expert Research:
Rachael H
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Lindsey S
Written by:
Lindsey S
Employee Laura H
Updated by:
Laura H
Employee Wilson B
Updated by:
Wilson B
Employee Alexander C
Updated by:
Alexander C
Employee Cole B
Installed by:
Cole B

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.