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  1. Gooseneck and Fifth Wheel Adapters
  2. Bulldog
  3. Gooseneck Trailer to Fifth Wheel Hitch
  4. Replaces Inner and Outer Tubes
  5. 30000 lbs GTW
  6. Gooseneck Coupler Adapters
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
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Retail:$467.18
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Gooseneck and Fifth Wheel Adapters
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Shipping Weight: 68 lbs
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Bulldog Gooseneck and Fifth Wheel Adapters - BD0289590300
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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. Guaranteed Lowest Price 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.
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  • Reviews (306)
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Bulldog Gooseneck and Fifth Wheel Adapters - BD0289590300

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

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


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


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

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




Video Transcript for Bulldog Gooseneck and Fifth Wheel Adapters - Adapts Trailer - BD0289590300 Review

Today we're going to be taking a look at the Bulldog gooseneck to fifth wheel trailer coupler adapter. This unit allows you to pull your gooseneck trailer with a fifth wheel hitch simply by installing this square king pin adapter. Simply replace both the inner and outer tubes of the gooseneck with this unique system, this unique coupler. Both inner and outer tubes are included. The unique coupler fits the same as a gooseneck coupler that has inner and outer tubes. It's a very sturdy construction.

It does feature the load bearing pinch bolt and two set bolts, so all that's included. Again, durable construction. It's got that steel construction with a raw finish for easy welding. It is adjustable to fit your application. With it fully retracted, what we can do is take a measurement from the bottom of this plate to the top of the unit. I'm going to put a straight edge up there.

We're going to measure from the bottom of the plate to that straight edge. That's going to give us a measurement of pretty close to 23 1/8", maybe 23 3/16", right in that area. With the unit fully extended, that measurement increases to about 31 1/8" to 31 3/16", right in that area. That gives us a range of adjustment of 8". The outer tube on this unit's going to measure 4 1/2" by 4 1/2".

That's outer edge to outer edge. Inner tube is a 4" by 4" inner tube. Capacity for this unit is 30,000 pounds. Then the max vertical rating is 9,000 pounds. Please note that this coupler replaces both the inner and outer tubes. A professional will need to remove the original coupler and weld on the new coupler.

That's going to do it for today's look at the Bulldog gooseneck to fifth wheel trailer coupler adapter.


Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (306 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.

- BD0289590300
by:

Excellent quality very well made fast delivery Would buy again



- BD0289590300
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I am well pleased with the quality of this product. I used it when modifying my gooseneck to a fifth wheel.



- BD0289590300
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.



- BD0289590300
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- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


First trip the king pin was not welded properly and came off. I now have a damaged truck and trailer. I expect a full refund for the hitch. I also will be speaking with an attorney to see what my options are.


Comments
I will have our customer service team reach out to you. The coupler does have a three year warranty.
-- Etrailer Expert Jenny N - 12/06/2021


- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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.


Comments
Still loving it. Hook up is so much easier
Dean B - 03/28/2021


- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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.


Comments
I reached out to my contact at Bulldog and sent him the photos of your coupler adapter. Based on the photos, my contact confirmed that this coupler is per their prints for the product. This coupler has a raw finish so that the end user can paint it to match the trailer. Because there is no paint or primer on the coupler, surface rust can occur and would need to be cleaned off before painting.
-- Etrailer Expert Victoria B - 10/15/2019


- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


I'm well satisfied with the adapter, shipping and overall experience with etrailer. The link you emailed to track the order worked great. The adapter seems very well constructed.



- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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.



- BD0289650300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


Excellent, interchanges with my gooseneck hitch so I can trailer either way depending on equipment



- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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



- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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.



- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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.



- BD0289650300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


It works well and makes the trailer hookup much easier! My only concern was with the box it arrived in as it was just rattling around in the box ripping holes throughout the cardboard, no damage to the item since it is literally bullet proof!


Comments
I will have our customer service team reach out to you.
-- Etrailer Expert Jenny N - 12/13/2021


- BD0289650300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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!!


Comments
Product works great, shipping was fast and installation was very easy. Quality built and very heavy duty. I would definitely purchase it again, thanks.
Tim S - 09/01/2018



- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


The bulldog gooseneck to 5th wheel adapter has saved me time. It make leaving the 5th wheel in my truck a reality. Now my travel trailer and equipment trailers are all 5th wheel connections. Back under to connect, simple. They tow smoothly with less jerking. It is bare metal, so paint to match.


Comments
A year later, painting the bulldog adapter was a wise choice. No rust has formed because I primed and applied a topcoat black finish of rust inhibiting paint. Ease of use, speedy trailer connection, and the stability the fifth wheel brings to my towing is unmatched. Highly recommend this for anyone interested in fifth wheel towing. The gooseneck connection in my truck bed hasn’t been used since I change the trailer connector and it’s been wonderful.
Travis - 08/29/2021


- BD0289580300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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.



- BD0289650300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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.


Comments
After a year’s worth of towing with this hitch I’m loving it, I’ve put many thousand miles on the set up and love the stability it adds to my tow. The product is very well built and I haven’t had a single problem with it. If your considering this product don’t hesitate its well worth the money.
Dale - 06/03/2020


- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


I shared pictures of trailer hitch, vin #, an explained the item needed. I received conponent, the workmenship was real good, fit perfect into trailer hitch. Thank you for being so helpful



- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


Product that I ordered was out of stock at the time so they suggested I ordered this part when I received the part the holes didn't line up with bolts in my trailer so I called about it and they said I can send it back but they refused to pay for shipping or give me a credit for shipping amount which is 45$.. sent me a replacement part AGAIN and the holes on it was drilled in diagonal totally unusable offered to pay for shipping on second part but not the first one even though it's not the one I ordered in the first place didn't want me to speak to a supervisor or manager.. definitely will not be using these people again....i paid 45$ to be ripped off



- BD0289580300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


Great workmanship, quality product, great investment….



- BD0289650300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


Fabulous, takes minutes to switch between, I prefer the true fifth wheel.



- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


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.



- BD0289640300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


excellent product performs as needed . like it so well we just left it on trailer to only use with tractor.Would like to even look into changing pickup over to fifth wheel so it would be easier to hook up trailers with loads.The only issue I had was a small bead that was on the inside of trailer tube that hindered insertion of hitch.Would definitly do it again. We put it on flat bed gooseneck trailer to use with semi so it would free up pickup


Comments
product is still performing well makes hooking up gooseneck so much easier
Greg H - 05/04/2021


- BD0289650300
by:

Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters


1st class shipping speed, emails and updates when it shipped. Good hitch fit my trailer and my semi truck as should. No paint,but that's better. Paint would not let it slide in easy like it did. Funny how some squirrels complane about paint. I guess they should offer 109 color codes.


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Show More Reviews

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

  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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...
  • 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?




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