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Gooseneck and Fifth Wheel Adapters > Adapts Gooseneck Trailer > Gooseneck Trailer to Fifth Wheel Hitch > Replaces Inner Tube > Gooseneck Coupler Adapters > Adjustable Height > Adapts Trailer > Standard > 30000 lbs GTW > Redline


Gooseneck to Fifth Wheel Trailer Adapter - Square

Redline Gooseneck and Fifth Wheel Adapters

ratingratingratingratingrating (1 reviews)


Code:   KP84HB

Price:$244.95


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Shipping Weight: 55 pounds

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Redline Gooseneck and Fifth Wheel Adapters - KP84HB

  • Capacity: 30,000 lbs GTW
  • 4" Square
  • Pin hole diameters measure 3/4"
  • Wall thickness: 3/8"

Most gooseneck trailers are designed to be towed on a gooseneck hitch ball located in the bed of the tow vehicle. However, this king pin and pipe assembly is designed for those wanting to tow a gooseneck trailer with a 5th wheel hitch. The 4" O.D. square tube will fit as an inner pipe on most standard gooseneck outer tubes. Always follow manufacturer's torque specs when tightening set screws. This adapter is used to convert the HBQ2516ADJ Bulldog coupler to a king pin fifth wheel adapter.








Customer Reviews

Gooseneck to Fifth Wheel Trailer Adapter - Square - KP84HB

Average Customer Rating:  ratingratingratingratingrating5.0 out of 5 stars   (1 Customer Reviews)




- KP84HB

ratingratingratingratingrating by: Clark Fabris01/07/2011

Is this review helpful?


Customer Satisfied I Have a 36' Float gooseneck trailer that we use for our hay business. We recently decided to change to a small semi and replace our one ton trucks for pulling due to the size of the loads we carry. After a little research we found that we could change our hitch out and pull the trailers that we have instead of replacing them. I priced around on the internet and found etrailer.com was the best price with free shipping! I ordered the hitch online and instantly received an order confirmation followed quickly by the shipped confirmation. I was also quickly informed that the shipping had been sped up and i would receive it even quicker! I was able to follow the progress of the tracking the whole time. I was very satisfied and will return for more trailer parts needs in the future. Sincerely, Clark Fabris Oklahoma Hay Express Inc.5169



Ask the Experts about this Redline Gooseneck and Fifth Wheel Adapters
Expert Answers about Gooseneck to Fifth Wheel Trailer Adapter - Square - KP84HB                                            Do you have a question about this Gooseneck and Fifth Wheel Adapters?


  • Towing capacity of the Gooseneck to Fifth Wheel Trailer Adapter - Square, for BullDog Coupler
  • The towing capacity of the, # KP84HB, Gooseneck to Fifth Wheel Trailer Adapter - Square is 30,000 pounds. This item is produced for converting the BullDog 32 inch - 42 inch HammerBlow Gooseneck Coupler - 25K, item # HBQ2516ADJ, to a king pin for attaching to a fifth-wheel hitch.
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  • Recommendations for Reducing Sway with a 53 Foot 4 Car Wedge Trailer
  • It is possible, but not likely, that a fifth-wheel setup will help reduce the sway that you are experiencing when towing your 53 ft. 4 car wedge. The gooseneck setup that you are using should be appropriate for towing the trailer and normally gooseneck setups are rated for higher towing and tongue weights than fifth-wheel setups. In my experience, on the farm with hay, livestock and a tractor once in a while, the best defense against sway is proper trailer loading. You will need to position t
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  • Will Redline Gooseneck to Fifth Wheel Trailer Adapter # KP84HB Fit Fifth Wheel Plate On A Mack Semi
  • The Redline Gooseneck to Fifth Wheel Trailer Adapter # KP84HB has a 2 inch industry standard kingpin. If your Mack semi fifth wheel plate accepts a 2 inch kingpin, then this adapter will work. This adapter is designed to fit the inner tube on most standard gooseneck square tubes. It has a 4 inch square outside diameter. I also have the Wallace Forge Gooseneck to Fifth Wheel Trailer Adapter # 2085205. It has a 2 inch kingpin and is designed to fit the inner tube on most standard gooseneck roun
    view full answer...

  • How Can I Pull a Gooseneck Trailer with My 5th Wheel Hitch in My 2005 Ford F-150
  • Yes, we have both a product that will accomplish what you are looking to do and a video that features the product being installed into a truck. You could use a Gooseneck to Fifth Wheel Trailer Adapter - Square, part # KP84HB, like you referenced. This would allow you to tow your gooseneck trailer with your fifth wheel hitch. Another option is to get a Pro Series 25K Gooseneck Plate for Fifth Wheel Rails by Draw-Tite, part # 49080. This product will install onto the rails of your fifth whee
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  • Parts Needed to Tow a Gooseneck Trailer with a 5th Wheel Trailer Hitch in a 2006 Ford F-350
  • I think in this case the best option is to go with a gooseneck coupler that has a king pin on it like # KP84HB, that you have referenced. This is going to be the least expense and since it is height adjustable you will not have to worry about adding or height to the front of the trailer. For this coupler to work you would need to have a square outer gooseneck tube that will accept a 4 inch square inner tube. And the outer tube will need to have 3/4 inch diameter pin holes. If you have a ro
    view full answer...

  • Wall Thickness of Redline Gooseneck to Fifth Wheel Trailer Adapter - Square, # KP84HB
  • I contacted Redline to obtain the information you requested. The wall thickness of this item, part # KP84HB, is quoted as 3/8 inch.
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  • Hitch Pin Recommendation for the Redline Gooseneck to Fifth Wheel Adapter # KP84HB
  • The hitch pin that I would recommend for the Redline Gooseneck to Fifth Wheel Adapter, # KP84HB, is the Redline Hitch Pin, # 346H. This hitch pin has a diameter of 3/4 inch and a length of 6 inches and it will work with the coupler adapter that you referenced. I verified the compatibility with my contact at Redline.
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  • Towing a Gooseneck Trailer with a 5th Wheel Trailer Hitch
  • All of the replace inner square tube adapters that we carry like # KP84HB 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 trailer
    view full answer...

  • Square Tube Gooseneck Coupler Adapter Recommendation
  • We offer 2 square tube gooseneck-to-fifth-wheel coupler adapters, the Redline Coupler Adapter, # KP84HB, and the Bulldog Coupler Adapter, # BD0289650300. These are quality couplers that would do an excellent job. If I were choosing one of these couplers, I would go with the Bulldog coupler because it has a wider bottom plate similar to a fifth wheel pin box that will make more contact with the fifth wheel hitch. It also has a small curved lip at the front of the plate making it easier to sli
    view full answer...


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