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Pull your gooseneck trailer with a fifth-wheel hitch by installing this round 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:
Specs:
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.
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Average Customer Rating: 4.7 out of 5 stars (303 Customer Reviews)
Pull your gooseneck trailer with a fifth-wheel hitch by installing this round king pin adapter. Simply replace both the inner and outer tubes of the gooseneck with this unique coupler and you're ready to tow.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.
Wow needed it asap and they didn't let me down .product was perfect and customer service out standing can't wait to show the build thank you
Works great, came without paint.
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.
Dean B - 03/28/2021Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
Excellent quality very well made fast delivery
Would buy again
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.
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
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.
Dale - 06/03/2020Review 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.
Jenny N - 12/06/2021Review 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.
Victoria B - 10/15/2019Review 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!
Jenny N - 12/13/2021Review 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.
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
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.
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.
Travis - 08/29/2021Review 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.
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!!
Tim S - 09/01/2018Review 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
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
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.
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.
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.
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
Greg H - 05/04/2021Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
great product, great vendor
Jeff - 05/23/2022Do you have a question about this Gooseneck and Fifth Wheel Adapter?
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