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

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B and W Gooseneck Hitch Ball - BWGNXA4585
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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 800-298-1624 for expert service.
  • All Info
  • Reviews (138)
  • Q & A (11)
  • Videos (2)
  • Photos
  • Why etrailer?

B and W Trailer Hitch Ball

  • 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, this ball extender moves the pivot point of your trailer 4" rearward to provide additional cab clearance.


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)
  • 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


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

Item # BWGNXA4585




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 Gooseneck Trailer Hitch Offset Ball Installation - 2014 Toyota Tundra

Speaker 1: Today on our 2014 Toyota Tundra we're going to be taking a look at the four inch offset ball for B&W turnover gooseneck trailer hitch, part number BWGNXA4585. This is what our offset ball looks like, it's going to be 2-5/16, and it's going to replace the ball that comes with the hitch kit. Now what this is going to do, it's going to provide you with more clearance between your cab and your trailer.You're simply going to drop into place, and it's going to move your pivot point point back four inches. So with the ball that comes with the kit, it's going to give you 7,500 pound vertical load limit, and a 30,000 pound gross towing capacity. When you switch to this offset ball, this is going to drop your total weight capacity, or towing capacity, to 20,000 pounds and your vertical load limit to 5,000 pounds. So keep that in mind.You always want to check your owners' manual, though, to make sure your vehicle can withstand the amount of weight and pick the lowest number between the two.This is going to have a nice powder coat finish to resist any corrosion, you can see it's nice thick steel so we're not going to have to worry about it bending or breaking.

It's also going to have a square base so it's going to drop down inside the hole nicely and it's going to keep it from spinning when loading and unloading the trailer.Now you're simply going to line up your holes with each side of the truck, drop it into place. Lock your pin, you're ready to go.That'll do it for a look at the four inch offset ball for B&W turnover gooseneck trailer hitch, part number BWGNXA4585 on our 2014 Toyota Tundra.


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   (138 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
by:

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



- BWGNXA4585
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!



- BWGNXA4585
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.



- BWGNXA4585
by:

These guys are the best Prompt and no screw ups professional



- BWGNXA4585
by:

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



- BWGNXA4585
by:

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



- BWGNXA4585
by:

good product



- BWGNXA4585
by:



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


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


Comments
Thanks for your review. This gap is normal since it fits a few different vehicles. It is safe and should not bend. You can put a washer there for peace of mind, but as long as you do not go over the weight capacity, it is not necessary.
-- Etrailer Expert Sierra K - 03/17/2021


- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


High Quality, Heavy duty 4” offset ball mount that works perfectly with the B&W turnover gooseneck hitch system. Adapted my 30’’ fifth wheel trailer with the Ranch regular gooseneck adapter—now no more heavy lifting and lots more room in the truck bed.



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


Fast shipping... The B&W 4in extension hitch ball is really good. I have used it a couple of times works great wish I had gotten one sooner. Problem I had was in a newer 2500hd the gooseneck was to close to toolbox and really close to rear window. With this extender ball problem is solved...



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


This hitch extender fit in perfectly. The height and 4 inches of movement really helped the gooseneck trailer to have more clearance. Thank you etrailer for having this BW 4 inch extension.



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


Great product, and perfect fit. Gave me the perfect offset that I needed to keep my trailer from hitting the cab. Highly recommend if you have a short wheel base truck and pulling a deck over gooseneck trailer!



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


Hauled at 20,000 at least once a week. Iv got a long box but I needed to clear a fuel tank pump with my 5th wheel but hooked up with a flatbeds hauled from San Diego to Washington. Paint of course on the ball is rubbed off and in the sleve is a little warn but otherwise after a year I'm satisfied and would buy another. I had my doubts at first but now I'm impressed. It's a stout product. I'd recommend this to anyone



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


This product works great for short bed truck. This product gives you more turning radius with out knocking your back window out. Truck is a 2500 Ram, pulling 42ft gooseneck.



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


I have used the B & W 4" offset ball extention for about one year. It does what I needed it to do - move the fifth wheel back a little in order to stand behind an opened tailgate on my pickup while hooked up. I considered it a necessity with the Reese Goosebox I installed on my 2017 Chevy Silverado 3500. PROs: Fit very well in the bed of the truck. Moved the fifth wheel back a little so I could access the back of the truck with the tailgate open. Also raised the fifth wheel up just a little to provide more clearance from the bed rails to the bottom of the fifth wheel overhang. This extention is really heavy duty and is made out of thick steel. CONs: It is heavy, which is to be expected. The paint almost immediately came off the welded on hitch ball. I grease the ball with every usage and paint chips still come off the hitch ball and in to the receiver tube of the Reese Goosebox. I would buy this again, as it seems to be the only product on the market to extend the hitch back on the B & W hitches.



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


I am so impressed with the personnel and the shipment time. I placed my order on 02/08/21 and received my order today 02/10/21. Awesome response from e trailer. It has been a rainy day here In Virginia and I have not gotten to install and try out my 4” goose neck hitch extension. I will respond further with details and pictures after I get it installed in my B&W hitch.



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


I have a 2005 F 250 crew cab short box. I changed from a 5th wheel for simplicity and ease of switching from a trailer to a slide in camper. So, this is all I have to remove in order to be able to put the camper on. I am getting older and this is just enough weight to carry around. The offset is perfect to jackknife the trailer. The towing with this set up is way better than the fifth wheel. Way more solid feeling and no clunking. I should have done this years ago.


Comments
Excellent. Like it - Will never go back to a fifth wheel.
Jim - 11/04/2018



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


I use this device to provide more clearance for the pin box on my 5th wheel toy hauler in conjunction with an Andersen hitch. It has eliminated the pin box hitting the rails of the pickup bed but enables me to keep the 5th wheel 4” further back from the cab—the cab would be 4” closer if I just reversed the Andersen mount.



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


Truck tailgate was too close to horse trailer propane tanks when hooking up. This GN hitch extender gave me the clearance needed to hookup without raising tailgate before finishing the backing-up process.


Comments
Works to clear tailgate of propane tanks on trailer. Second extender Ive bought. First was for a Curt double lock pin. The original turnover would fall through to the pavement unless one person held the hitch while another locked it in place. The extender made it a one-person job.
Chuck - 02/21/2020



- BWGNXA4685
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


Excellent service and very knowledgeable about their products. Quick delivery. Product is VERY heavy duty weighing nearly 20 pounds. Trailer is in the shop but will add to the review once I have a chance to hook up trailer and see if this adds the clearance between the nose of the trailer and cab of the truck that I need because of having a short bed.



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


Product works as it should. Well built and needed for short bed trucks!!



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


Love it! Have a short bed dodge diesel and this offset is a must have for our camper. Was a little concerned about putting off center pressure on my hitch but everything seems to be holding up well. Would definitely recommend to anyone with a short bed.


Comments
Well
CN - 06/16/2019



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


The off set ball works great for my 2008 Dodge Ram 3500 Mega Cab. I converted from a rail mounted sliding fifth wheel to a B&W hidden goose neck hitch. With the short bed, I was concerned about turning too short and the trailer hitting the truck cab. I have been able to make some very tight turns with no issues.



- BWGNXA4085
by:

Review from a similar Offset Turnoverball in Trailer Hitch Ball


Great B&W product super fast on the shi pping


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Show More Reviews

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...
  • 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...
  • 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...
  • 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...
    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...
  • 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...
    Image 1 for
  • 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...
  • 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...
    Image 1 for
  • 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...
  • 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...
    view full answer...
  • Can the Reese Goose Box RP94716 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...
    view full answer...

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Info for this part was:

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

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