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Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches

Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches

Item # BW57FR
Our Price: $599.00
Gooseneck Installation Kit

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Install a Companion fifth-wheel hitch in your truck bed with this custom kit. Better than a traditional mounting kit, this setup doubles as a gooseneck hitch when the fifth wheel is removed, and the underbed design allows for full bed access. 1-800-940-8924 to order B and W gooseneck installation kit part number BW57FR or order online at Free expert support on all B and W products. Great prices and Fastest Shipping for Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches. Gooseneck Installation Kit reviews from real customers.
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B and W Gooseneck Installation Kit - BW57FR

  • Below the Bed
  • B and W
  • Turnover Gooseneck
  • Installation Kit

Install a Companion fifth-wheel hitch in your truck bed with this custom kit. Better than a traditional mounting kit, this setup doubles as a gooseneck hitch when the fifth wheel is removed, and the underbed design allows for full bed access.


  • Lets you install your B&W Companion 5th wheel trailer hitch (BWRVK3500 or BWRVK3400)
  • Doubles as heavy-duty Turnoverball gooseneck trailer hitch
    • Includes rails, gooseneck hitch head, safety chain loops, and hitch ball
  • Provides complete truck bed access when you're not towing
    • Single hole in center of bed is mounting point for hitch
  • Installs easily using existing holes in your vehicle's frame
    • No welding or frame drilling required
    • Truck bed does not have to be removed
    • 4" Diameter hole must be cut into bed
  • Powder coated steel is sturdy and corrosion resistant
  • Made in the USA
  • Limited lifetime warranty

B&W Turnoverball Gooseneck Trailer Hitch

B&W Turnoverball Gooseneck Hitch

Not only does this kit provide you with a sturdy, custom base for installing your Companion fifth-wheel trailer hitch in the bed of your truck, but it also doubles as one of the most recognizable gooseneck hitches on the market. This fifth wheel installation kit actually is the Turnoverball gooseneck hitch from B&W.

Gooseneck Specs:

  • Gross towing weight: 30,000 lbs
  • Vertical load limit: 7,500 lbs
  • Ball size: 2-5/16"

B&W Companion Installed in Turnoverball Gooseneck Hitch

With the B&W Turnoverball underbed gooseneck trailer hitch you get the best of both worlds. When you go to tow a gooseneck trailer, the Turnoverball creates a sturdy, dependable connection with your trailer. And when you're done towing, you can stow the ball upside down in the hitch to get full bed access and a clean appearance. When you're ready to tow your fifth wheel trailer, just install the Companion in the ball hole in place of the gooseneck ball and lock the post in place using the built-in handle. You can remove the fifth wheel when you're done towing, leaving your truck bed open once again.

Simple, Custom Installation

This kit is custom designed for your vehicle. The 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 ball and drill holes for the built-in safety chain loops - there is no need to weld onto or to drill into your frame.

Galvanic Corrosion Limiting Tape

Note: Because the body of your truck is constructed of aluminum, there is an increased risk of galvanic corrosion when a different metal, such as steel, contacts the truck body. To help prevent this corrosion, strips of polypropylene tape are included to provide a barrier between the steel of the hitch and the aluminum of the truck. These strips are to be applied to the center section of the gooseneck hitch as shown above.

Once you have the brackets and center section installed, set up the operating handle. This handle is designed to be accessed from the rear driver's-side wheel well. On the end of the handle is the heavy-duty steel pin that secures the mounting post of the Companion (or the base of the gooseneck hitch ball).

GNRM1121 B and W Turn Over Ball Under-Bed Rail Kit

GNRC900 B and W Turn Over Ball Center Section

Installation Details BW57FR Installation instructions

This Product Fits The Following Vehicles

Video of Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches

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

Video Transcript for Review of B and W Gooseneck Installation Kit - Installation Kit - BW57FR

Hello everybody, this is Jess at Today we're going to take a look at this custom under bed B and W Companion fifth wheel trailer hitch, with the installation kit. It has a 30,000 pound gross towing weight capacity. Now this is a custom fit part. It is designed to fit the 2021 Ford F150 trucks Does fit all bed lengths. One note is it will not fit the Ford Raptor model.

And on a custom fit part like this, I always like to recommend for you to go to our website, use the fit guide, put in your year and model vehicle and it'll show if this will work for your application. Now this will let you install a B and W Companion fifth wheel trailer hitch to your truck. And that companion hitch is available in either a fixed hitch, part number B-W-R-V-K-3500 or this slider hitch part number B-W-R-V-K-3400. Both of those companion hitches we do sell separately on our website. And they're usually listed on this product page as a related product.

Just to give you an example of what we're talking about, there's the example of the fixed hitch design, the Companion hitch. And the companion hitch is a nice heavy duty fifth wheel trailer hitch. And it'll install into this installation kit by inserting that square post right there. You can see that square posts in the middle of the companion hitch, that'll fit right into this ball hole on this mounting kit. So that single hole, in the center of the bed, is your mounting point for the hitch.

After you install the hitch in the ball hole, then you just slide the handle and that'll lock the post in place using the built-in handle here. On the end of this handle, there's a large 5/8" thick spring loaded steel locking pin, that'll go all the way through that center post to secure it in place. This access handle is accessible at your rear driver's side wheel well. Now you can remove the fifth wheel when you're done towing, just pull out your handle, twist it to hold it open, and then you can pull out the whole fifth wheel itself. And then that'll allow you to have full truck bed access to use your truck for normal use if you want.

But what's nice about this, better than your traditional mounting kit, this setup will double as a heavy duty turnover ball gooseneck trailer hitch. It does include this 2 5/16" diameter gooseneck hitch ball. It does also have the spring loaded safety chain hookups which are built in. It is all a nice, simple coated steel, which is powder-coated steel, which is sturdy and corrosion resistant. And if you want to install your gooseneck, if you're going to tow a gooseneck, same way. You can see it's a square base. You just drop it in. Same way. Release the pin and that'll lock it in place. And now you can tow your gooseneck trailer with it. When you're done, you can open the handle back up. If you want to store this, you can just flip it over. There's no handle on it. You can turn it upside down. That's how it gets the name turnover ball. And then release the lock and it locks it in place. And then you'd have a nice full truck bed access again. It is a very simple installation. It comes with the included custom mounting kit, which we've already installed to show you what it looks like. There's no welding required and the truck bed does not have to be removed for this to be installed. All you have to do is take a four inch diameter hole in the truck bed. So you could access this opening and then four half inch diameter holes for the safety chain hookups. As you can see, I got laid out here on the front, everything it comes with. It comes with the mounting hardware you need, nice set of detailed instructions that'll describe how it installs. And also what's nice is you notice since the Ford truck bodies that this'll fit on is aluminum, they do give you some polypropylene tape to provide a barrier between the steel and the aluminum bed to reduce the risk of corrosion. And on the instructions we've mentioned, it'll show you where to put this polypropylene tape to reduce that risk of corrosion. This part is made in the USA. Gooseneck specs on this, the gross towing weight capacity is 30,000 pounds. Vertical, low limit would be 7,500 pounds. But that should do it for the review on the custom, under bed B and W Companion fifth wheel trailer hitch with the installation kit..


See what our Experts say about this B and W Gooseneck Installation Kit

  • Which B and W Companion Hitch Rail Kit Fits 2021 Ford F-150 Short Bed
    The B and W Companion hitch rails for a 2021 Ford F-150 is the part # BW57FR which is different from what fit a 2020 Ford F-150. So if you had a 2020 rail kit currently you'd need to replace it with the # BW57FR so you could use a Companion hitch like the # BWRVK3400 slider hitch.
    view full answer...
  • Recommended B&W Turnoverball and Fifth Wheel Hitch for 2011 Chevrolet Silverado 3500 With 8 Foot Bed
    The Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches # BW57FR is designed to fit the 2021 Ford F-150 so it is not compatible with your truck. You need the B&W Turnoverball Underbed Gooseneck Trailer Hitch w/ Custom Installation Kit - 30,000 lbs # BWGNRK1012. Once this is installed, you will be able to use a hitch like the B&W Companion Gooseneck-to-5th-Wheel Trailer Hitch Adapter - Dual Jaw - 20,000 lbs # BWRVK3500. Regarding your air bags, it looks like all...
    view full answer...
  • What Do I Need To Install A 5th Wheel Hitch In My 2022 Ford F-150 Hybrid With 6-1/2
    We do! I recommend picking up the B&W Companion # BWRVK3400-5W which connects to your 2022 Ford F-150 via the B&W Gooseneck Hitch # BW57FR. This system gives you a sliding hitch so you have enough trailer to cab clearance during sharp turns and then the gooseneck installs so only the receiver and safety chain loops are exposed so you have a completely clear bed when you aren't towing. Something else you might be interested in is an in-bed 7-Way like the Bargman # 54701-003-010 so it's...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Wilson B
Updated by:
Wilson B
Employee Noah M
Updated by:
Noah M
Employee Carrie F
Updated by:
Carrie F
Employee Alexander C
Written by:
Alexander C

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