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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 Hitches

4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitches

Our Price: $165.00
You Save: $22.99
Trailer Hitch Ball
Shipping Weight: 19 lbs
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4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitches 20000 lbs GTW BWGNXA4085
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Designed for use with B&W's Turnoverball gooseneck hitch, this ball extender moves the pivot point of your trailer 4" rearward to provide additional cab clearance. Great Prices for the best trailer hitch ball from B and W. 4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitches part number BWGNXA4085 can be ordered online at or call 1-800-940-8924 for expert service.
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  • Reviews (253)
  • Q & A (0)
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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, 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 all B&W Turnoverball gooseneck trailer hitches except for the following:
    • For Toyota Tundra applications use BWGNXA4585
    • For Dodge Ram 1500 applications use BWGNXA4685
  • Square ball base prevents ball from turning in hitch during hookup
  • Powder coated steel resists corrosion
  • Made in the USA


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


GNXA4085 B and W Turn Over Ball Gooseneck 4" Hitch Ball Extender

Item # BWGNXA4085

California residents: click here

Customer Satisfaction Score:

Customer Reviews

4" Offset Ball for B&W Turnoverball Gooseneck Trailer Hitches - BWGNXA4085

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

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


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?






This product works great and allows so much more usable room in the bed than our previous 5th wheel hitch which, was becoming too heavy to remove frequently when needing to haul materials.

Etrailer Expert

Mike L.


@Dean We're happy to hear that the # BWGNXA4085 offset gooseneck ball is working well for you.


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.


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


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.


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.


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

Etrailer Expert

Sierra K.


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.


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


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.


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...


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.


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!


Strongly built and helps provide needed clearance.



Ball is still in great shape and has performed as described. It has helped improve my turning capabilities greatly!


Works perfectly!!!



Offset ball has been great, no issues and very well built quality unit


this offset ball has helped towing my fifth wheel, keeping it away from the truck cab when turning or backing tight. I would highly recommend this.

Carlos G.


Has been extremely great

Carlos G.


A year has passed, and I rely and enjoy using this product, I never tow without it. For those campers that doubt their tight turns and backing maneuvers, this product will put you at ease.


Awesome hitch and haven’t smashed my back window. Also love the customer service at etrailer! I will definitely be a returning customer for my future trailer needs.


Used with Ram 2500 short bed . Great product, works perfect. The offset allows cab and tool box clearance while pulling our 5th wheel camper. I have used etrailer with other purchases . They have always delivered on time and have provided good customer service. Thanks etrailer


Perfect fitting high quality part. Good welds, good powder coat. Not much else to say.


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.



The BnW hitch extender is working great. Perfect fit.


Great to move a gooseneck back. Definitely does it’s job but if you have a 6’ bed you still have to watch the back window because you can still smash it out.


This works absolutely perfect in a Ram 3500 with 6 1/2 ft bed, and the Gen Y gooseball hitch.
I think if more people knew of this combination, the fifth wheel style hitch, Anderson hitch and others would become obsolete.
Get to your destination, disconnect, pull out the ball, and the bed of your truck is free!


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.



Excellent. Like it - Will never go back to a fifth wheel.


The extension ball has worked very well on our F250 with a 6 1/2 foot bed. Been in a few tight turns and it allowed the 5th wheel to turn.


This did exactly what I wanted. F-350 long bed, needed to move the trailer connection back just a bit so I could drop the tail gate down while connected. Also, now have enough room to line up and hook up without having to get out and close the tailgate to finish hooking up the trailer.


It gave me the extra 4 inches needed for my short box.


Great piece of equipment. Protects my truck from damage

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