bing tracking image
  1. Gooseneck and Fifth Wheel Adapters
  2. CURT
  3. Gooseneck Hitch to Fifth Wheel Trailer
  4. Connects to Gooseneck Hole
  5. 20000 lbs GTW
  6. Hitch Adapters
Curt X5 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Trailer Hitches - 20,000 lbs

Curt X5 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Trailer Hitches - 20,000 lbs

Item # 16310
Our Price: $670.75
You Save: $40.08
Gooseneck and Fifth Wheel Adapters
This item qualifies for Free Shipping
Shipping Weight: 105 lbs
In Stock
16310 - Connects to Gooseneck Hole CURT Gooseneck and Fifth Wheel Adapters
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
Install this adapter in the square ball hole of your B&W Turnoverball gooseneck hitch to get above-bed base rails for your fifth-wheel trailer hitch. Universal rails provide attachment points in your truck bed for a standard fifth-wheel hitch. 1-800-496-5010 to order CURT gooseneck and fifth wheel adapters part number 16310 or order online at Free expert support on all CURT products. Great prices and Fastest Shipping for Curt X5 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Trailer Hitches - 20,000 lbs. Gooseneck and Fifth Wheel Adapters reviews from real customers.
  • All Info
  • Reviews (234)
  • Q & A (0)
  • Photos
  • Why etrailer?

CURT Gooseneck and Fifth Wheel Adapters - 16310

  • Gooseneck Hitch to Fifth Wheel Trailer
  • Connects to Gooseneck Hole
  • 20000 lbs GTW
  • CURT
  • Hitch Adapters
  • Adapts Truck
  • Fixed Height
  • No Offset

Install this adapter in the square ball hole of your B&W Turnoverball gooseneck hitch to get above-bed base rails for your fifth-wheel trailer hitch. Universal rails provide attachment points in your truck bed for a standard fifth-wheel hitch.


  • Adapter mounts in your gooseneck trailer hitch to supply the above-bed base rails necessary for installing a 5th-wheel hitch
    • Works with B&W standard center Turnoverball hitches
    • Compatible with Curt, B&W, Demco Hijacker Premier Series, Draw-Tite, Hidden Hitch, Husky, Reese, and Valley above-bed 5th-wheel trailer hitches
  • Fast, easy installation
    • Drop adapter into square gooseneck ball hole and lock in place
  • Rubber pads help prevent the rails from rattling and sliding in the truck bed
  • Sturdy steel construction
  • Black carbide powder coat finish resists corrosion
    • Coated in liquid Aquence for superior durability and rust resistance
  • Assembled in the USA


  • Gross towing weight: 20,000 lbs
  • Vertical load limit: 4,000 lbs


  • Bed liners and bed mats may affect the fit of this adapter and trimming may be necessary
  • Will not work with fifth-wheel hitches or pin boxes that rotate.
  • Will not work with auto-slide fifth-wheel hitches.
  • Will not work with Husky 10-26K or 10-16K fifth-wheel sliders.
  • Will not work with B and W Patriot fifth-wheel sliders.
  • Will not work with any 2013 - 2016 Dodge Ram 3500 or 2014 - 2018 Dodge Ram 2500 trucks that have a B&W Turnoverball gooseneck hitch installed.
  • Will not work with any 2007 - 2016 Toyota Tundra truck that has a B&W Turnoverball gooseneck hitch installed.
  • Will not work with 2017 or newer Ford F-250 or F-350 trucks that have a B&W Turnoverball gooseneck hitch installed.
  • When using this adapter, you may have to remove the safety chain loops from your gooseneck hitch if they are mounted front/back rather than side to side.

16310 Curt X5 Fifth Wheel Adapter w/ Square Shank for B and W Turn Over Ball Hitches

Installation Details 16310 Installation instructions

Customer Satisfaction Score:

Customer Reviews

Curt X5 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Trailer Hitches - 20,000 lbs - 16310

Average Customer Rating:  4.7 out of 5 stars   (234 Customer Reviews)

Install this adapter in the square ball hole of your B&W Turnoverball gooseneck hitch to get above-bed base rails for your fifth-wheel trailer hitch. Universal rails provide attachment points in your truck bed for a standard fifth-wheel hitch.


This was super easy to install, and recently when we were pulling an 9,000 lbs 5th wheel, it performed flawlessly. well worth the money, and with the added bonus of keeping our Goose-neck hitch for our Hay trailer.


Items arrived intact in original packaging, hitch components are well built for heavy duty applications also arrived ahead of the projected date. UPS gave regular updates of travel location and delivery date.

Heavy duty, tight fit, no rattle. Thanks
Tim - 11/02/2022


Great product. Easy to use. Fast to install. If it doesn’t lock-in your under body hitch, spin it around 180 degrees and it will lock.


Great product! Ive pulled a 42' to Hell and back not one problem. It is heavy, but it's very solid. My fifth wheel hitch fit straight in. Way cheaper than having to put rails in if you have a factory ball hitch in the bed. Its It's also nice that it's removable so you can haul furniture, or things that can't sit crooked ect. Great product, should last forever. Definitely would recommend


Received the Curt X5 B&W turnover ball adapter yesterday. Would have been easier to drop in with two people but I was able to do it myself. Dropped right in, and in less then 15 seconds it was dropped and locked. Saved me lots of install time on 5th wheel rails. Set my RBW lil' rocker hitch on and pulled my 10,000 lbs 32' 5th wheel across town without issue. I feel that this is probably the strongest way to go when running a 5th wheel to turnover ball adapter, and its only about $*** which is a fraction of the cost for those other weird complex adapters that side load or flex. Customer feedback was great with optimal response time on my questions.


I love this hitch adapter. I mostly pull gooseneck trailer, but occasionally I need to pull a fifth wheel. Easy to get in and I haven't had any problems getting it back out when I was done with it.


I feel the product works as it is intended but I did have a hard time setting it low enough for the pin to engage without using the weight of the trailer to push down on the Curt

Many times the hitch head is adjustable. You may be able to adjust the height there, and also the king pin is commonly adjustable as well.
-- Etrailer Expert Brooke M - 11/11/2022


Received product 4 days after ordering with free shipping. Seems really well made. No noises or clunks when towing. It dropped right in to my b&w gooseneck and my Reese 5th wheel dropped directly into it. Good product.


The rails are well made. But on the heavy side I’m reluctant to pull it out. I would like them to stay put also, they tend to move around some with the B&W hitch.

As long as you do not have a B&W Patriot or a thick bed liner this should be compatible. I would just be sure that every fastener is tightened down and you should be good to go.
-- Etrailer Expert Sierra K - 01/26/2022


I cannot not say enough about trailer. Always have had my back with price,knowledge, and the best customer service.
I have the Curt X5 Adapter and love it.
I have it coupled to the Q24 her hitch
My tow vehicle is a 2013 GMC 3500 Dually 4WD and tow a 40' 18k 2012 Keystone Raptor


This is just what I was looking for, already had Curt R5 slider hitch, put B&W hitch on new truck. Tried a gooseneck adapter, but too much flex. Went back to 5th wheel hitch. This adapter is built heavy, weighs over 100lbs by itself. I pull a 14,000lb toy hauler, with a F250 shortbed, needed the slider. I feel much safer with this product. Ordered from e.trailer, shipping was right on, only 3 days.


Managed to get my hands on a curt E16 5th wheel hitch and couldn’t be happier with the combination. The drop in weighs 100lbs and is honestly really easy to install. The hardest part is getting it from where it’s stored to the back of the truck.


Everything fits perfectly. I like having the option to switch between 5th wheel and gooseneck hitches by pulling one pin.


Really impressed with the quality of the Curt product. Worked out great, fitting my new to me 98 Dodge 3500. Thanks etrailer.


Fit like a glove. Dropped right in and I installed the 5th wheel hitch in no time. Heavy and well built.


this base rails provide easy installtion of your 5th wheel hitch into the bed of your trucl


Nice fit esay to set up, no issues and works with my 16k B&W Patriot 5th wheel hitch, no issues. A lot better option then a new B&W Companion hitch or reconfiguring the truck bed to remove the existing B&W gooseneck


Fits right in. Just what I needed to use the hitch I already owned wit my B &W gooseneck. Awesome price also.


Correct product delivered quickly. Customer service was exemplary.


I recently purchased a used '08 Ford F-350 with a B&S turnover gooseneck hitch. I wanted to use a Reese 16k hitch that I already own and put it in this truck without doing the typical bed rails to attach the fifth wheel hitch. I contacted Etrailer and they quickly identified the Curt X5 adapter to solve my issue. Ordered new adapter and in 3 days I had the unit and everything fit perfectly. This is the second time I have dealt with Etrailer in the last 6 months and I continue to be impressed with all aspects of this company. I'm glad I found Etrailer 6 months ago when I was looking for trailer hub and brake parts. I knew just who to turn to with my latest needs. Thanks Etrailer!

Great. Works well to allow me to go from goose neck to fifth and back again with ease. Very satisfied!
Joe S - 07/03/2016


Nice fit, very well built. My 20000 lb Reese manual slider fit it perfect. Thanks


Ordered Curt X5 Fifth Wheel Adapter for my B&W Square Shank Turnover Ball Hitch and received it in two days. Had it installed in my trucks in a matter of minutes. Just pulled out the ball and inserted the adapter, no holes to drill in my truck bed and simply unpin it and remove it to have full use of my bed. Love it!

It is great! Just got back from a 4800 mile trip and unhooked my fifth wheel and pulled the pin and removed everything from my truck bed. The only way to go!
Wayne H - 05/30/2016


Very very pleased, good solid steel. Mounted right up to my BW hitch and adapted to my Curt 20K fifth wheel hitch. No issues at all.


Ordered on Monday and it was delivered on Wednesday. Kaleigh was very helpful with the ordering process.


Very helpful people to answer any questions my part got here in a fashionable time and install was easy. Recommend this company to anyone and everyone!

Show More Reviews

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

< Previous
123. . .13

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

  • Why

    At we guarantee:
  • Real product know-how.

    We make sure that the products we sell are what we say they are, and that they work the way they are supposed to work. Get real advice from a real person who has the knowledge and expertise needed to solve your problem.
  • Most detailed, accurate gooseneck and fifth wheel adapter information available.

    Because we take providing accurate product information seriously, we take our own detailed product photos, demo videos and installation videos, as well as verify measurements, instructions, and vehicle fit information.
  • Installations, made easy.

    We love helping people and have the most highly-trained customer service, hands-on experience, step by step videos and installation instructions.
  • Fast shipping.

    Your order is automatically routed to get out of our warehouse and to your door as quickly as possible. Receive free shipping on orders over $99.
  • Personalized service for life.

    We provide one-on-one, personalized service from the ordering process through the life of your product.
  • Trusted since 1946.

    We've been serving customers since our parts store first opened in 1946 and continue to be recognized by our customers, our vendors and third parties for exceptional service.
  • Returns Policy

    Need to return an item? No problem. Please read our Returns Policy for more information.

Info for this part was:

Employee Mike L
Expert Research:
Mike L
Employee Robert G
Expert Research:
Robert G
Employee Patrick B
Expert Research:
Patrick B
Employee Michael H
Expert Research:
Michael H
Employee Jeff D
Expert Research:
Jeff D
Employee Jameson C
Expert Research:
Jameson C
Employee John H
Expert Research:
John H
Employee Adam R
Expert Research:
Adam R
Employee Jeffrey L
Expert Research:
Jeffrey L
Employee Adele M
Updated by:
Adele M
Employee Wilson B
Updated by:
Wilson B
Employee Amanda M
Updated by:
Amanda M
Employee Jenny M
Updated by:
Jenny M
Employee Hannah L
Updated by:
Hannah L
Employee Kristina F
Updated by:
Kristina F
Employee Isabelle B
Updated by:
Isabelle B
Employee Manda E
Updated by:
Manda E
Employee Matthew K
Test Fit:
Matthew K
Employee Andrew L
Video Edited:
Andrew L

At 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.