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  1. 5th Wheel Hitch Rails
  2. B and W
  3. Below the Bed
  4. Custom
THIS ITEM IS NOT A FIT FOR
1991 Ford Van
B and W

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

Part Number: BW46FR
In Stock
$599.00
5th Wheel Hitch Rails
Not Confirmed to Fit

1991 Ford Van

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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 5th wheel hitch rails part number BW46FR or order online at etrailer.com. 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. 5th Wheel Hitch Rails reviews from real customers.
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B and W 5th Wheel Hitch Rails - BW46FR

Highlights

  • Custom Fit for Your Vehicle: Mounting brackets install to your truck's frame.
  • Full Bed Access When Not Towing: Underbed design keeps the truck bed clear once the hitch is removed.
  • Tows Heavy Fifth Wheel or Gooseneck Trailers: Rated for 30,000 lbs gross towing and 7,500 lbs vertical load.
  • Simplifies Setup: Bolts to existing frame holes—no welding or frame drilling required.
  • Doubles as a Gooseneck Hitch: Works as a heavy-duty Turnoverball system with 2-5/16" ball.
  • Built to Last: Powder coated steel resists corrosion for long-term durability.
Made in USA

Features to know about

Full Bed Use When You’re Not Towing: Underbed Design Keeps the Truck Clear

This setup mounts completely below the bed so you keep full use of your truck when the hitch isn’t in place. The 4" diameter opening in the bed is the single mounting point for the hitch ball or Companion post, leaving the surface clean and unobstructed. When you’re done towing, just flip the ball over into its socket and you’ve got a flat bed again for hauling gear or loading pallets.

Two Hitches in One: Turnoverball System Handles Gooseneck and Fifth Wheel Towing

The Underbed Installation Kit functions as both a gooseneck and a fifth wheel foundation. It’s the same heavy-duty Turnoverball gooseneck hitch that’s rated for 30,000 lbs gross towing weight and a 7,500-lb vertical load limit, with a 2-5/16" ball size. When you need to pull a gooseneck trailer, drop in the ball and latch it with the built-in handle. When it’s time for fifth wheel towing, remove the ball and mount your B&W Companion hitch into the same opening for a secure lockup.

B&W Companion 5th wheel hitch installed in a truck bed using the Turnoverball Gooseneck Hitch base, demonstrating towing setup.

No Welding or Frame Drilling: Custom Fit Uses Existing Holes in the Frame

Installation is straightforward since the custom brackets line up with existing holes in the truck’s frame. You’ll cut the 4" bed hole for the hitch ball and small holes for the safety chain loops, but there’s no frame drilling or welding needed. The heavy-gauge, powder-coated steel brackets and center section bolt together for a strong, corrosion-resistant base that’s built to last.

Roll of galvanic corrosion limiting tape included with B&W underbed hitch installation kit to prevent metal corrosion during installation.

Built for Heavy Loads: Solid Attachment and Reliable Operation

The Turnoverball design keeps the connection tight and solid for confidence under heavy loads. The operating handle, accessed from the driver’s-side wheel well, locks the steel pin into the ball or Companion post for a secure hold. When you’re not towing, the ball stores right in the hitch, so there’s nothing to misplace and no loose parts rolling around.

Specs

Towing Capacity

  • Gross towing weight: 30,000 lbs
  • Vertical load limit: 7,500 lbs

Hitch Ball

  • Ball size: 2-5/16"

Detailed view of B&W Turnoverball Gooseneck Trailer Hitch showing hitch ball, safety chain loops, and mounting components for use with Companion 5th wheel hitches.

GNRK1222 B and W Turn Over Ball Gooseneck Trailer Hitch

GNRM1222 B and W Turn Over Ball Under-Bed Rail Kit

GNRC1252 B and W Turn Over Ball Center Section

Installation Details BW46FR Installation instructions

This Product Fits The Following Vehicles




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See what our Experts say about this B and W 5th Wheel Hitch Rails

  • Which B&W Companion 5th Wheel Hitch For 2024 Toyota Tundra
    Hi Cory, There is a B&W Companion 5th wheel hitch that will work with your 2024 Toyota Tundra with a composite bed, though it is a different part number than the one you asked about, as that one is for Chevy/GMC trucks with a puck system. Instead, you'll need the mounting rails (which even doubles as a gooseneck hitch), and either a fixed or sliding Companion. You'll need the fixed hitch if you have an 8 foot bed, and the sliding hitch if you have a short bed. The correct parts to add...
    view full answer...
  • 5th Wheel Hitch and Suspension Upgrade for a 2022 Toyota Tundra
    I would be happy to help you set your 2022 Toyota Tundra up for towing. Let me start out by confirming the weight on those parts. The Curt X5 5th Wheel Base Rails Adapter item # 16310 weighs 105 lbs. The Custom Underbed Installation Kit item # BW46FR weighs 104 lbs. Toyota really puts you in a box when it comes to options for towing a 5th wheel trailer. You are correct you can not add the Turnover ball system and air bags. There are other suspension options like the Timbren Active...
    view full answer...
  • Recommended 5th Wheel Rails for a 2022 Toyota Tundra
    Yes, there is one adapter that will allow you to install a set of industry standard rails to use your Andersen Ultimate Rail Mount Hitch. It is the Curt X5 5th Wheel Base Rails Adapter item # 16310. This adapter is confirmed to work with your Anderson Hitch. It has a 20,000 lbs capacity. In order to use this adapter you will need to install the Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches item # BW46FR. This underbed gooseneck platform is custom fit and...
    view full answer...
  • Does Demco Make an Autoslider 5th Wheel Hitch for a 2024 Toyota Tundra?
    Hey Paul! You are correct Demco does make Autoslide 5th wheel hitches like item # DM8550034. The problem is the only way to add any set of 5th wheel type of connection to your 2024 Toyota Tundra is with the Turnoverball Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches item # BW46FR, due to the composite bed your truck has. The B&W Turnoverball Gooseneck Hitch item # BW46FR does have an compatible adapter that provides you with a set of base rails, Curt XD item...
    view full answer...
  • How to Get Industry Standard 5th Wheel Base Rails on a 2022 Toyota Tundra
    To get some standard base rails in the bed of your 2022 Toyota Tundra you need to install the B&W gooseneck hitch and use the Demco adapter rails: - B&W Custom Underbed Installation Kit # BW46FR - Demco 5th Wheel Base Rails Adapter # DM6140 This gives you the rails that the Andersen Ultimate Connection # AM3200 will fit to so you can use it with your Tundra.
    view full answer...
  • 5th Wheel Trailer Hitch For A 2022 Toyota Tundra With A 6.5 Foot Bed
    I have just the perfect fifth wheel hitch for your 2022 Toyota Tundra! There is two parts that you will need to install the hitch into the bed of your truck first you will need The Installation Rail Kit # BW46FR and The B&W Fifth Wheel Hitch # BWRVK3400-5W. The Rails have a powder coated steel which is sturdy and corrosion resistant. The rails install easily using the existing holes in your vehicle's frame. The B&W Companion 5th Wheel Trailer Hitch w/ Slider # BWRVK3400-5W will help...
    view full answer...

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Info for this part was:

Employee Lindsey S
Edited by:
Lindsey S
Employee Joshua S
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Joshua S
Employee Dustin K
Video Edited:
Dustin K
Employee Chris R
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Employee Ryan G
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