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  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
Retail:$174.59
Our Price: $165.00
You Save: $9.59
Trailer Hitch Ball
Shipping Weight: 16 lbs
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Designed for use with B&W's Turnoverball gooseneck hitch (BWGNRK1257) for your Toyota Tundra, ball extender moves the pivot point of your trailer 4" rearward to provide additional cab clearance. For 2022 and newer, use the BWGNXA4085. Great 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 1-800-940-8924 for expert service.
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  • Reviews (253)
  • Q & A (0)
  • Photos
  • Used (1)

B and W Trailer Hitch Ball - BWGNXA4585

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

Designed for use with B&W's Turnoverball gooseneck hitch (BWGNRK1257) for your Toyota Tundra, ball extender moves the pivot point of your trailer 4" rearward to provide additional cab clearance. For 2022 and newer, use the BWGNXA4085.


Features:

  • 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)
    • For 2022 and newer Tundra's the BWGNXA4085 is the correct offset ball
  • Square ball base prevents ball from turning in hitch during hookup
  • Sturdy steel construction
  • Made in the USA


Specs:

  • 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


Note: For 2022 and newer Tundra's the BWGNXA4085 is the correct offset ball.



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




California residents: click here


Customer Satisfaction Score:


Customer Reviews

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

Average Customer Rating:  4.8 out of 5 stars   (253 Customer Reviews)

Designed for use with B&W's Turnoverball gooseneck hitch (BWGNRK1257) for your Toyota Tundra, ball extender moves the pivot point of your trailer 4" rearward to provide additional cab clearance. For 2022 and newer, use the BWGNXA4085.

by:

I don't typically leave reviews, but this product earned one. Everything went on exactly how it should with zero issues. The measurement for the hole was perfect. The hardware used was top notch and had no issues torquing to spec. The install was quick, and every step of the way was simple and thought out, and communicated effectively in the instruction pages. VERY impressed with the kit, and how strong everything is. This is going to be a huge help for towing our mules around with the tundra. Big thanks to etrailer for the communication and fast shipping, making sure I could get this installed before mule days!



by:

This is our second one, I got tired of moving back and forth between trucks. This helps give needed clearance for short bed trucks to the cab and long bed truck with the tail gate to our LQ horse trailer.



by:

We have ordered 2 trailer hitches. They both arrived in a few days and both were exactly what we expected. I would definitely order from them again and recommend them!



by:

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!



by:

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



by:

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.



by:

Very happy with the quality of this part and look forward to using it on my Tundra to pull our Camper. Shipped quickly and am overall impressed with the experience I've had with E-Trailer.



by:

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



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These guys are the best Prompt and no screw ups professional



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good product



by:

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



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This product is exactly what I needed to offset our new “Reese Goose-box” pin box to better accommodate the clearance for the fuel tank and tool box in the bed of our truck. Thanks to the knowledge of the “etrailer” staff (specifically Stacy) she went the extra mile, taking additional time to assure all the products I needed were perfect for my application. Thank you Stacy for all your assistance and patience with my order.
P.S. I added the yellow strip down the center of the pin box to help guide me when hooking up. Perhaps “Reese” will add this little idea to their future pin boxes as an option?



by:

I have used this offset ball in the B&W gooseneck hitch I installed in my regular box 2022 Chevy 3500 to tow our 13K GVWR fifth wheel with Reese Goosebox for over six months now and I love it! The offset ball combined with the placement of the hitch in a 2020+ Chevy means I can turn a full 90 degrees if necessary. And fully loaded, our truck is still within specs on all weight ratings, including rear axle weight.



by:

The 4 inch offset ball is very heavy made. I have no concern hauling a trailer with this.



by:

After installing the Gen Y Executive gooseneck hitch on our 5th wheel camper I needed more clearance in my 2016 GMC 6.5' truck bed. I already have the B&W Turnover hitch on my truck and this gave me 4" offset to the rear of my truck and 2" of lift. After 1 year of using this setup I am very pleased with the ride and towing.



by:

Love how well this works. There are some offsets that are bigger but this worked well. I have a 5th wheel that has a gooseneck adapter and this gives me in my short bed truck a little bit more turning radius.



by:

I haven’t used it yet, I am concerned about it being about 3/4” off the bed. I am thinking about pupping a spacer between it and the bed. Worried about it bending



by:

Great product and what I needed for a mega cab to pull Rv camper with goose box


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Show More Reviews

See what our Experts say about this B and W Trailer Hitch Ball

  • Which Offset Ball for B&W Turnover Ball Gooseneck Hitch in 2019 Ford F-350
    For the B&W Turnover Ball Gooseneck Hitch in your 2019 Ford F-350, you'd want to use the # BWGNXA4085. The difference between this offset ball and the one for the Tundra and the Ram 1500 is the depth of the gooseneck receiver where the ball sits. If you used either the BWGNXA4685 or the BWGNXA4585 the receiver won't be deep enough for the ball to secure into the hitch.
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  • Recommended B&W 4 Inch Offset Ball For A 2017 Dodge Ram 3500
    The 4 inch Offset Ball for B&W Turnoverball Gooseneck Trailer Hitches # BWGNXA4085 is the offset that will work with your 2017 Dodge Ram 3500. It has a powder coated steel that resists corrosion and is made in The USA. The weight capacity for the ball is up to 20,000 pounds and has a vertical load limit of 5,000 pounds. I attached a review video link below.
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  • 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.
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  • 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....
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    Image 1 for
  • 4" Hole Location For B&W Turnover Ball Gooseneck Hitch On a 2020 Toyota Tundra
    The hole for the B&W Turnoverball Underbed Gooseneck Trailer Hitch # BWGNRK1257 is to be placed at 42-3/8" from the rear of the truck bed and centered between the fenders on your 2020 Toyota Tundra. The hole location is the same for all bed lengths of your Tundra. This information is found in the installation instructions which I have linked below. A 4" Offset Ball # BWGNXA4585 can be used in place of the original ball for increased clearance and turning radius.
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    Image 1 for
  • 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.
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  • Is a Hitch Extender Required for Short Bed Ford Super Duty Towing Enclosed Gooseneck Horse Trailer
    It's possible that you will need an offset adapter for a Ford Super Duty Short Bed towing an enclosed gooseneck horse trailer but it really comes down to the shape of the loft. I recommend measuring your clearance with the trailer attached to be certain but it's not a bad idea to use an offset adapter to give you more clearance anyhow as it would be close even if it did clear. If you have a B&W Turnoverball Gooseneck Trailer Hitch then you can use the 4" Offset Ball for B&W Turnoverball...
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  • 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.
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  • Which B&W Offset Ball Will Fit A 2018 Ford F-250 Short Bed With A B&W Gooseneck Hitch Installed?
    For your 2018 Ford F-250 with the 6-3/4 foot bed, you will want to use the 4" Offset Ball # BWGNXA4085. This will fit your B&W Turnoverball # BWGNRK1116, which is the only B&W gooseneck hitch available for your truck, without any issue at all. There are other offset balls needed for a Toyota Tundra and a Ram 1500 ( # BWGNXA4585 and # BWGNXA4685 respectively), so there are a couple other models, but aren't really relevant for your truck.
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  • 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...
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  • Correct 4" Offset Gooseneck Hitch Ball for 2022 Toyota Tundra with B&W Turnoverball
    I spoke to B&W and they recommended using the 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitches part # BWGNXA4085 with the B&W Turnoverball Underbed Gooseneck Trailer Hitch part # BW96FR on a 2022 Toyota Tundra. The 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitch for Toyota Tundra part # BWGNXA4585 was for the previous generation Toyota Tundra which has a shallow hitch pin hole, it's not advised for the new generation.
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  • 4" Offset Gooseneck Ball For B&W Turnover Ball Hitch On a 2020 Ford F-250 Short Bed
    You will need the 4" Offset Ball # BWGNXA4085 for the B&W Turnoverball Underbed Gooseneck Trailer Hitch # BWGNRK1116 on your 2020 Ford F-250 short bed. The Offset Ball # BWGNXA4585 that you found is only for the Hitch # BWGNRK1257 on a Toyota Tundra due to the hitch being shorter than a traditional B&W Turnover Ball.
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  • 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).
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  • Gooseneck Installation Kit and In-Bed 7-Way Vehicle Connector for 2021 Toyota Tundra 6 1/2 Foot Bed
    For your 6 1/2' bed 2021 Toyota Tundra, I recommend the B&W Turnoverball Underbed Gooseneck Trailer Hitch w/ Custom Installation Kit item # BWGNRK1257. B&W is the best in the business and you will have no issues installing the Turnover Ball system in your truck. This hitch is custom designed for your Tundra. The included mounting brackets bolt to existing holes in your truck's frame. While some modification is required - you will need to cut a 4" diameter hole in your bed for the hitch...
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  • Determining What Is Needed For Gooseneck Trailer Turning Clearance On 5-1/2' Bed 2019 Toyota Tundra
    Thank you for the images Barb, but you are going to have to take a couple measurements to verify what is going to work best for your exact situation. It looks like you have a 2019 Toyota Tundra with the B&W Turnoverball Underbed Gooseneck Trailer Hitch # BWGNRK1257 for the 5-1/2' bed. I do see according to the image provided your trailer is 80" wide so to make a full jack knife turn you would need more than 40" from the center of the hitch ball in the bed to the cab. This is not likely...
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  • B&W Gooseneck Hitch for a 2021 Toyota Tundra
    I have a great gooseneck hitch for your 2021 Toyota Tundra with a 6 1/2 foot bed. I recommend the B&W Turnoverball Underbed Gooseneck Trailer Hitch item # BWGNRK1257. The B&W gooseneck hitch has a gross towing weight of 30,000 lbs a vertical load limit of 7,500 lbs, and 2-5/16" ball. It is custom fit for your Tundra, the mounting kit requires no welding, and the truck bed does not have to be removed. You will have to cut a 4" diameter hole into the bed. The hitch is powder coated steel...
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  • 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...
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  • What Reese Goose Box Do I Need for My 2021 Grand Design Solitude 3740BH?
    Thanks so much for the photos and the information! I went ahead and called my tech at Lippert, and she confirmed that your 2021 Grand Design Solitude 3740BH has a 1621HD pinbox This is important to know when determining the bolt pattern on your pinbox. Also, from my available specs, your trailer has a gross vehicle weight of 16,800 pounds. With all of this in mind, the Reese goose box you need is the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter # RP85FR. I went ahead...
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  • Is B and W Only Sliding Fifth Wheel Hitch that Fits Turnoverball Rail Kit
    B and W is the only company that makes a sliding hitch that fits directly to the Turnoverball rail kit with the part # BWRVK3400 but Curt makes their X5 adapter part # 16310 which fits the Turnoverball and adapts it to a set of above bed fifth wheel rails that standard hitches fit like the Curt A20 Slider part # C16541.
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  • Can the Reese Goose Box RP85FR be Used With a Short Bed Truck
    We do have a variety of offset gooseneck balls available to help with short bed trucks. That being said, this will depend on the gooseneck hitch and the vehicle that is towing. For example, the B&W Offset Gooseneck Ball # BWGNXA4585 will only fit the B&W Turnoverball installed on a Toyota Tundra. Again, this is just an an example and you will need to confirm which system you have in your truck. That also being said, these are technically supposed to be used with long bed trucks. They can...
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  • Goose Neck Trailer Hitch Receiver For Towing a 5,000LB Trailer With a 2021 Toyota Tundra 5-1/2 Bed
    The B&W Turnoverball Underbed Gooseneck Trailer Hitch # BWGNRK1257 for your 2021 Toyota Tundra with the 5-1/2' bed is rated for up to 30,000lbs towing and 7,500lbs of tongue weight. You will need to check your owners manual for your specific towing capacity as it ranges from 7,800-10,200lbs depending on how it is equipped. The 4" Offset Ball # BWGNXA4585 will help you gain some additional turning clearance. A Hopkins Endurance 5th Wheel/Gooseneck 90-Degree Wiring Harness # 41157 will...
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  • Recommended B&W Offset Ball for a 2012 GMC Sierra
    Thanks for the pictures! It looks like your 2012 GMC Sierra has the B&W Turnover Ball System item # BWGNRK1057. You will need the 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitches # BWGNXA4085. The 2-5/16" offset ball will give you an additional 4" of clearance when towing your gooseneck trailer. You can use this with your Super Ride 5th Wheel hitch but since the hitch ball will add height you will need to make adjustments to your coupler accordingly. A better option would...
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    Image 1 for Image 2 for
  • Gooseneck Trailer Hitch Fit For 2020 Toyota Tundra With 5-1/2 Foot Bed
    We do have an option for a gooseneck trailer hitch for your 2020 Toyota Tundra with a 5-1/2 foot bed, but I checked with Curt and the # C60751 is not a fit for your truck. So I checked with B&W, who confirmed their gooseneck hitch will fit and install in your Tundra: - B&W Turnoverball Underbed Gooseneck Trailer Hitch # BWGNRK1257 So while it isn't the hitch you asked about, the Turnoverball is considered by most people to be the premier gooseneck in the industry. The reason is because...
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  • Can A Rotating Pin Box be used With A B&W Companion Gooseneck To 5th Wheel Adapter?
    Due to the a rotating pin box moving the pivot point off of the head of the hitch, it will cause too much movement and stress on an adapter like the B&W Companion # BWRVK3400 (sliding) or # BWRVK3500 (fixed). Due to this, you cannot use rotating pin boxes with this type of adapter, unfortunately. With that being said, what you may want to look at is the Reese Goose Box 5th-Wheel-to-Gooseneck Air Ride Coupler Adapter, like the # RP85FR for a 1621 pin box, coupled with an offset gooseneck...
    view full answer...

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Used Items Available
Used Picture for 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitch for Toyota Tundra
Used Picture for 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitch for Toyota Tundra

Condition: Surface Scratches

Notes: Item has minor cosmetic scratches.

Our Price: $167.64
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Info for this part was:

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

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