1. Trailer Hitch Ball
  2. B and W
  3. Gooseneck Hitch Ball
  4. 2-5/16 Inch Diameter Ball
  5. Turnover Ball
  6. 20000 lbs GTW
4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitch for Toyota Tundra

4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitch for Toyota Tundra

Item # BWGNXA4585
lowest price pledge
Our Price: $147.37
You Save: $61.17
Trailer Hitch Ball
This item qualifies for Free Shipping
Shipping Weight: 16 lbs
B and W Gooseneck Hitch Ball - BWGNXA4585
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

In Use/Installed

Customer Photos

Designed for use with B&W's Turnoverball gooseneck hitch (BWGNRK1257) for your Toyota Tundra, this ball extender moves the pivot point of your trailer 4" rearward to provide additional cab clearance. Lowest Prices for the best trailer hitch ball from B and W. 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitch for Toyota Tundra part number BWGNXA4585 can be ordered online at etrailer.com or call 800-298-8924 for expert service.
  • All Info
  • Reviews (7)
  • Q & A (8)
  • Videos (2)
  • Photos
  • Why etrailer?

B and W Trailer Hitch Ball - BWGNXA4585

  • Gooseneck Hitch Ball
  • 2-5/16 Inch Diameter Ball
  • Turnover Ball
  • B and W
  • 20000 lbs GTW
  • Powder-Coated Steel
  • 4 Inch Offset

Designed for use with B&W's Turnoverball gooseneck hitch (BWGNRK1257) for your Toyota Tundra, this ball extender moves the pivot point of your trailer 4" rearward to provide additional cab clearance.


  • Extension provides 4" of additional space between your truck's cab and your gooseneck trailer
    • Works with B&W Turnoverball gooseneck trailer hitch for the Toyota Tundra (BWGNRK1257)
  • Square ball base prevents ball from turning in hitch during hookup
  • Sturdy steel construction
  • Made in the USA


  • Ball size: 2-5/16"
  • Offset: 4"
  • Distance from center of locking pin hole to bottom of square base: 1-1/6"
  • Weight capacity: 20,000 lbs
  • Vertical load limit: 5,000 lbs

GNXA4585 B and W Turn Over Ball Gooseneck 4" Hitch Ball Extender for GNRK1257 for Toyota Tundras

California residents: click here

Video of 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitch for Toyota Tundra

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

Video Transcript for B and W Hitch Ball - Gooseneck Hitch Ball - BWGNXA4585 Review

Today were going to review Part# BWGNXA4585. This is the B&W 4-inch offset ball for the B&W turnover gooseneck trailer hitch, Part# BWGNRK1257.This offset ball will move your pivot point of your trailer 4 inches rearward to provide additional cab clearance. It is designed to work exclusively with the B&W turnover gooseneck trailer hitch, Part# BWGNRK1257. This has the square ball base which will prevent the ball from turning in the hitch during hookup. Its made of a sturdy steel construction. The part is made in the USA.

The ball size on it is 2-5/16th in diameter. Again, the offset is 4 inches so its measured from the center of the square base to the center of where the ball is. If we put a ruler on this, just to give you an idea of the 4-inch that youll be gaining center to center, this will provide additional cab clearance for you.It does have a weight capacity of 20,000 pounds. It has a vertical load limit or pin weight capacity of 5,000 pounds.What I want to do here is Im going to rotate the table here. What I ended up doing as I pulled that turnover ball gooseneck hitch Part #BWGNRK1257, I have it right here, the hitch head just to give you an idea of what it looks like.

You pull out the ball that comes with it. You can see it has a square opening. All you have to do, if this will be the rear of your truck bed and this is will be where the truck cab is, what you do is you drop this in that square opening. Once it drops in, you can see it moves that ball from this hitch another 4 inches rearward that provides your additional clearance. Its very easy to do.

Then, you just release your handle and the pin would lock this adaptor into place.That should do it for the review on Part# BWGNXA4585, the B&W 4-inch offset ball for the B&W turnover gooseneck trailer hitch, Part# BWGNRK1257. .

Customer Reviews

4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitch for Toyota Tundra - BWGNXA4585

Average Customer Rating:  5.0 out of 5 stars   (7 Customer Reviews)

Designed for use with B&W's Turnoverball gooseneck hitch (BWGNRK1257) for your Toyota Tundra, this ball extender moves the pivot point of your trailer 4" rearward to provide additional cab clearance.

- BWGNXA4585

The hitch was perfect. I did have it installed by my local RV team. They did an awesome job for about $450. Not too bad, and give me a level of comfort I needed to tow my horses in the 5th wheel horse trailer. E-trailer filled my order efficiently, expeditiously and all the relevant information was readily available on the web page. Thanks! 112266

- BWGNXA4585

Works great. I pull a 3h with my short bed Tundra and this gave me the extra breathing room I needed 477004

- BWGNXA4585

good product 447737

- BWGNXA4585

Received the product promptly and great customer service. Have not used it yet but very excited to give it a try! 334929

- BWGNXA4585

It works it's made by b&w so you know it's good 331408

- BWGNXA4585

I have a Tundra CrewMax with a super short bed and this ball was the key for safe towing of my goose neck trailer. It gave me the extra 4 inches of clearance so I could make tight corners without worrying about hitting the cab with the trailer. Great product. 208044

- BWGNXA4585

These guys are the best Prompt and no screw ups professional 174921


Ask the Experts about this B and W Trailer Hitch Ball

  • Can the 4 Inch Offset Ball for B&W Turnoverball Be Used With the Anderson Ultimate
    For starters, the correct 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitches that is needed to use on a Dodge Ram 2500/3500 is part # BWGNXA4085 or part # BWGNXA4685 for a Dodge Ram 1500, not part # BWGNXA4585 which is for a Toyota Tundra. That said, you can use this with your Anderson Ultimate 5th Wheel to Gooseneck but since the hitch ball will add height you will need to make adjustments to your coupler accordingly.
    view full answer...
  • B&W Gooseneck Turnover Ball Adapter for 2015 Chevrolet Silverado 3500 with 6-1/2 Foot Bed
    The 4 Inch Offset Ball fro B&W Turnoverball Gooseneck Trailer Hitches, # BWGNXA4085, is a fit for your 2015 Silverado 3500 with 6-1/2 foot bed using B&W Turnoverball Underbed Gooseneck Trailer Hitch, # BWGNRK1012 . This ball will move your trailer 4 inches toward the rear of your truck to allow you extra clearance. There are almost identical adapters that are not compatible with certain hitches because they have a different length shank from center of pin hole to square base and only...
    view full answer...
  • Can 4 Offset B&W Gooseneck Ball be Used for More Clearance on a 5th Wheel Trailer
    If you have the B&W Gooseneck Hitch # BWGNRK1257 on a Toyota Tundra then you can use the 4" Offset Ball # BWGNXA4585 to give yourself some more clearance. B&W also has the 4" Offset Ball # BWGNXA4085 which is more of a standard option if you don't have a Tundra. These can be used with any kind of gooseneck coupler without jeopardizing the integrity of the offset ball. If you have a different gooseneck hitch I'd need to know what you're using to see if we have a similar product that fits.
    view full answer...
  • Recommended Offset Ball for B&W Gooseneck Trailer Hitch
    I do have a solution for you, however the Draw-Tite 5" Offset Ball # 19308 mentioned in your question is not compatible with B&W gooseneck hitches. There a few compatible offset balls for your B&W Turnoverball Gooseneck Hitch, depending on the specific model that you have. To ensure you get the correct one, you just want to take a measurement from the locking pin hole to the bottom of the square base on your hitch ball. I have included an image that shows where you want to take this measurement....
    view full answer...
  • Will A Curt Offset Gooseneck Ball Fit Into A B&W Gooseneck Hitch
    I called my contact at Curt Manufacturing and they confirmed that the Curt 4" Offset Ball for Double-Lock Gooseneck Hitch part # C602 will not fit into the gooseneck ball location on a B&W gooseneck hitch such as the B&W Turnoverball Underbed Gooseneck Trailer Hitch part # BWGNRK1012. This is due to the fact that the Curt ball mounts for gooseneck hitches are circular in shape whereas the ball mounts for B&W gooseneck hitches are square. In order to gain a 4" offset with the B&W gooseneck...
    view full answer...
  • Difference Between the Three Different B and W Offset Gooseneck Ball Adapters
    The three B and W Offset Gooseneck Balls are designed for three different applications. The part # BWGNXA4085 is the one that fits nearly all of the Turnoverballs whereas the part # BWGNXA4685 fits the # BWGNRK1309 (newer Ram trucks) and the part # BWGNXA4585 fits the # BWGNRK1257 (newer Toyota trucks).
    view full answer...
  • Gooseneck Hitch Recommendation for 2013 Toyota Tundra with 5-1/2 foot Bed
    For your 2013 Toyota Tundra with a 5-1/2 foot bed the best option will be the B and W Gooseneck hitch part # BWGNRK1257 with the 4 inch extender part # BWGNXA4585. The extension won't help much, but if your trailer has a very narrow nose like a livestock trailer this would be best shot. If the trailer has living quarters and a wide nose you really won't have a way to do it.
    view full answer...
  • Towing Capacity of 2017 Toyota Tundra Crewmax 5.7L V8
    According to pages 167-169 of the online owner's manual for your 2017 Toyota Tundra Crewmax 5.7L V8 the most trailer weight this truck can tow is 10,100-lbs. You will want to refer to your printed manual too since this maximum capacity depends on the specific engine and drivetrain and whether or not you have the optional towing package. Many versions have lower capacities. You can also check with your local dealership using the truck's VIN. For 5th wheel towing in this truck your 5-1/2-foot...
    view full answer...

Do you have a question about this Trailer Hitch Ball?

  • Why etrailer.com?

    At etrailer.com we guarantee:
  • Highest quality trailer hitch ball for the best price.

    Our Lowest Price Pledge ensures you will never overpay for the parts you need.
  • 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 trailer hitch ball 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:

Written by:
Lindsey S
Expert Research:
Jameson C
Expert Research:
Jeffrey L
Video Edited:
Jacob T
Test Fit:
Shane H
Video by:
Jonathan Y
Updated by:
Hannah L
Updated by:
Kristina F

At etrailer.com 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.