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: 4.8 out of 5 stars (264 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
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 - 06/03/2020
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
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
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
The item itself was fine, I would have given it 5 stars but for the shipping. It was improperly packed for shipping it was put in a giant thin box with 1 piece of wrapping paper and with all it’s bouncing around it had ripped big holes in the cardboard box. It actually rolled out through the side when the delivery guy picked it up hitting his leg leaving it bleeding.
Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
Quality construction and materials and a perfect fit to convert my gooseneck coupler from ball to kingpin.
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.
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
Looks good, it’s exactly what I needed to get our living quarters trailer ready to pull with the Pete .
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.
Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
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!
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
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.
Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
A great option, I have two large 5th wheel trailers (RV & Gooseneck) and I tow them both with a short bed F350. With this setup on the Gooseneck, I can use the slider hitch and have no problems towing either trailer.
Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
I bought a fifth wheel camper trailer and mounted a B&W Companion hitch onto the gooseneck hitch in the bed of my truck. It is such a pain to take in and out, so I bought one of these for my horse trailer to see how they work. They work great, so great in fact that I bought two more for my stock trailer and flatbed trailer. The only negative I have is that the holes in the sides of the pipe for bolts, pins, etc., are not located 90 degrees from the front of the hitch plate and therefore will not line up with the holes in most receivers on the trailers. They are apparently drilled before the plate is welded on, because none of the three I bought are in the same relationship to the front of the plate.
Larry L - 04/18/2018Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
I just put it on yesterday and it was a very easy install (about 5 Minutes). I hooked my truck up with no problems. I wanted to use my gooseneck trailer without having to pull my heavy B&W companion fifth wheel out of my truck bed. Mission accomplished.
Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
First time buyer. Amazing customer service. Got my king pen adapter will order from here again Chris J did an excellent job
Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
This item is ONLY for Bull Dog tubes requiring a 15 degree offset. I did not know this until after putting it in my none Bull Dog tube (I have a Lippert chassis). Tested after installation and the offset was so pronounced that it caught on my receiver. Talked with manufacturer's technical expert, and he said that the industry standard is 15 degrees. Regardless, the adapter is expertly fabricated and of good strong steel. Just wish it worked for my trailer. etrailer.com was very good trying to resolve my concern to point Donna spent a lot of time researching a solution for me. Ultimately I shipped back the adapter because it was not doable for me. We both learned a lot today about trailers and the limitations on Bull Dog adapters.
Michael - 12/20/2018Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
This is the third adapter I have purchased from etrailer. One for my horse trailer, one for my dump trailer and now one for my equipment trailer. A little bit of time to paint and install and everything is fine. No more climbing in the pickup bed to hook and unhook, no chains to deal with. I prefer the 5th wheel to the ball gooseneck, much easier hook up when you can't see the ball in the bed of your truck. Quality is very good and they work. You won't find it cheaper anywhere else and they always ship quick.
JOSEPH H - 03/23/2018Review from a similar Bulldog Kingpin Adapter in Gooseneck and Fifth Wheel Adapters
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
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