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 # BWGNRK1108-5W

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Fifth Wheel Installation Kit

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Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches Below the Bed BWGNRK1108-5W
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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. Call 800-298-8924 to order B and W fifth wheel installation kit part number BWGNRK1108-5W or order online at Free expert support on all B and W products. Guaranteed Lowest Price and Fastest Shipping for Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches. Fifth Wheel Installation Kit reviews from real customers.
  • All Info
  • Reviews (13)
  • Q & A (42)
  • Videos (8)
  • Photos
  • Why etrailer?

B and W Fifth Wheel Installation Kit - BWGNRK1108-5W

  • B and W
  • Below the Bed
  • Custom

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.

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).

GNRM1108 B and W Turn Over Ball Under-Bed Rail Kit

GNRC800 B and W Turn Over Ball Center Section

BWGNRK1108-5W Installation InstructionsInstallation Details BWGNRK1108-5W Installation instructions

This Product Fits The Following Vehicles

1999 - 2010 Ford F-250 and F-350 Super Duty 6-3/4 Foot Bed

1999 - 2010 Ford F-250 and F-350 Super Duty 8 Foot Bed

2008 - 2010 Ford F-450 Super Duty 8 Foot Bed

Customer Reviews

Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches - BWGNRK1108-5W

Average Customer Rating:  4.9 out of 5 stars   (13 Customer Reviews)

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.

- BWGNRK1108-5W
2010 Ford F-250 and F-350 Super Duty

Great service. Fast shipping! 661477

- BWGNRK1108-5W

Works well, easy to install, very well built, have had absolutely no problem. I would recommend this setup for anyone wanting complete use of the bed when not towing. 606527

- BWGNRK1108-5W

Great product 604874

- BWGNRK1108-5W
2006 Ford F-250 and F-350 Super Duty

Ordered on a Thursday and received it the following Tuesday so the shipping is fast. The instructions are short and to the point with only 2 or 3 pictures so you have to use your head to install it. Very easy installation. 585202


If you click the provided link, you can see an install video showing the hitch being installed on a 2007 Ford F350.

-- Mike L - 11/27/2018


- BWGNRK1108-5W
2004 Ford F-250 and F-350 Super Duty

The install is pretty easy if you have a friend to help. I'm a very mechanically inclined guy and it still took a couple of hours to get this part of the install done but my end result is perfect. 561793

- BWGNRK1108-5W

Installs perfectly but I did have to remove my airbags to install it. Hoping to find a way to put them back in. 528776

- BWGNRK1108-5W

Easy to install & easy to use. 478141

- BWGNRK1108-5W
2007 Ford F-250 and F-350 Super Duty

Excellent products. Both hitches (goose and 5th) came as described and were built very well! B&W does not skimp on materials. At first, thinking about how the companion secures to the gooseneck I was skeptical about the strength of the to two working in tandem. Both work flawlessly, are easy to use and the companion comes apart to reduce weight when putting in and out of truck. Timely shipping from e trailer. Best price I could find. Easy install. 297199

- BWGNRK1108-5W

Excellent hitch. Use it with the companion 5th wheel hitch for a rock solid platform. Install was easy, fit finish was great. Awesome American made product. 250477

- BWGNRK1108-5W

Great product, shipped promptly, all items correct, and excellent pricing. Very happy with this purchase! 194355

- BWGNRK1108-5W

Installed easy enough just read your instructions and watch the online videos if you can. Customer service is unbelievable. They were the most helpful people I think I've ever done business with and just plain nice. Thanks etrailer 188048

- BWGNRK1108-5W
2002 Ford F-250 and F-350 Super Duty

High quality under bed turnover hitch. Instruction video a big help. 172006

- BWGNRK1108-5W
2001 Ford F-250 and F-350 Super Duty

Very well made hitch and easy install. Will buy again when needed. 159147


Ask the Experts about this B and W Fifth Wheel Installation Kit

Do you have a question about this Fifth Wheel Installation Kit?

  • Recommended Gooseneck And 5th Wheel Hitch For 2001 F-350 With 8 Foot Bed
  • Based on your photos, I can not identify the system you have and it appears that it was a custom job that doesn't work with current options. My recommendation is to remove the customized system and start over so you know that all of your parts are compatible. For your 2001 Ford F-350 with 8 foot bed, I recommend the Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches # BWGNRK1108-5W. This will give you the gooseneck hitch you want. This gooseneck system...
    view full answer...

  • What is the Best 5th Wheel and Gooseneck Hitch for a 2008 Ford F-450
  • In order to use the B&W Companion 5th Wheel Trailer Hitch part # BWRVK3500-5W in the bed of your 2008 Ford F-450 you will need to use the Custom Underbed Installation Kit part # BWGNRK1108-5W. The B&W Turnoverball Gooseneck Trailer Hitch is designed specifically to be used with the B&W Companion 5th Wheel Trailer Hitch and will also give you a gooseneck hitch while the 5th wheel hitch is not installed. The B&W Companion and B&W Turnoverball are considered to be one of the best hitch...
    view full answer...

  • Difference Between B and W Turnoverball Part Numbers # BWGNRK1108 and BWGNRK1108-5W
  • The two part numbers are actually the same rail kit/gooseneck hitch. Since they appear in the fitguide for both the gooseneck and fifth wheel hitches though we gave them slightly different part numbers to make it easier for us to organize. For your 2004 Ford F-350 Super Duty the Turnoverball rail kit part # BWGNRK1108 or # BWGNRK1108-5W is the correct kit and would work well for you.
    view full answer...

  • Installation of B&W Turnoverball Gooseneck on 2001 Ford F-350
  • The Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches # BWGNRK1108-5W is a great gooseneck system and is also a really nice combination with the B&W Companion 5th Wheel Trailer Hitch # BWRVK3500-5W on your 2001 Ford F-350. For this installation, you will need to slightly lower the exhaust and remove the heat shield as you mentioned. You will reinstall the heat shield so there won't be any issues with heat transfer. I double checked this with the manufacturer. Because...
    view full answer...

  • Can AirLift Air Bags and a B&W Turnover Ball Gooseneck Hitch be Installed on a 2005 Ford F-250
  • I do have an option for you. However, the AirLift air bag kit # AL88291 is designed to work only on trucks with a B&W fifth wheel hitch 1105 or 1199R, both of which are obsolete. Instad, take a look at the Air Lift LoadLifter 5000 Air Helper Springs # AL57397 (2WD) or # AL57398 (4WD). These kits are 100% compatible with your Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches # BWGNRK1108-5W. I confirmed this with my contact at Air Lift.
    view full answer...

  • Availability of Adapter for B&W Companion to Fit Round Gooseneck Receiver on a 2006 Ford F-350
  • I believe you are referring to a Tow Ready gooseneck hitch which was rebranded as "Draw-Tite" like part # 9460-49. There is a solution for you to use the sliding B&W Companion # BWRVK3400-5W in the short bed of your 2006 Ford F-350 but unfortunately there are no adapters for it to fit the round gooseneck receiver you currently have. Instead you will need to install the B&W Gooseneck Hitch # BWGNRK1108-5W which has the squared receiver you are needing. If you would rather not swap...
    view full answer...

  • Recommended Gooseneck And Fifth Wheel Hitch For 2002 Ford F-350 With 8-Ft Bed
  • Since you said you want to use your 2002 F-350 for a gooseneck and a fifth wheel I recommend the B&W Companion 5th Wheel Trailer Hitch, part # BWRVK3500-5W and part # BWGNRK1108-5W. This system requires no drilling in to the frame of your truck and gives you both the fifth wheel hitch and a gooseneck hitch, and also an empty bed that can be used for cargo when you are not towing . I have attached a link to an installation video for the custom installation kit you can check out. I...
    view full answer...

  • Parts Needed to Install Fifth Wheel Trailer Hitch in Bed of 2006 Ford F-350 Dually
  • For your 2006 Ford F-350 dually the best hitch setup around will be the B and W Companion hitch like the part # BWRVK3400 for if you have a short bed and need a slider hitch for cab clearance, or the part # BWRVK3500 which is a fixed hitch and would be the hitch to use if you have long bed truck. To install this in the bed of your truck will require you to use the rail kit part # BWGNRK1108-5W which is custom fit for your truck.
    view full answer...

  • Is There a Difference Between B&W Gooseneck Hitches BWGNRK1108-5W and BWGNRK1108
  • There is no difference between those two part numbers on your end. If you ordered either part number you'd get the same B and W Turnoverball Gooseneck Hitch part # BWGNRK1108. We have two part numbers though as this hitch shows up in the gooseneck and fifth wheel fitguides since Companion hitches like the part # BWRVK3400 fit it directly. The two part numbers allow us to organize them in our system and fitguides easier.
    view full answer...

  • Will Demco Recon Gooseneck to Fifth Wheel Adapter Work with B and W Gooseneck Hitch
  • Yes, the Demco Recon Gooseneck-to-5th Wheel Trailer Hitch Adapter # DM8550045 will work for you as it is designed to attach to the gooseneck ball of your hitch when securing so it will work great with a B and W Turnoverball part # BWGNRK1108-5W you have installed in your 2008 Ford F-250. Another option is the B and W Companion hitch that is designed to specifically work with this rail kit which if part # BWRVK3500.
    view full answer...

  • Can B&W Companion 5th Wheel Hitch # BWRVK3400-5W Install in F-350 with Bed Liner Installed
  • If your 2005 Ford F-350 has a sprayed-on bed liner then you're all set to install your B&W Companion. If it has a drop-in plastic liner then the liner will have to be trimmed out to allow the hitch base's "feet" to reach down to the actual truck bed itself. You may also need to trim around the gooseneck ball. The B&W Companion is among the most versatile hitch systems available and I have linked for you an installation video showing its use in a 2004 F-350.
    view full answer...

  • LoadLifter 5000 Compatibility With Reese Underbed Rail Kit On A 2006 Ford F-250
  • You can install a 5th wheel hitch with your AirLift LoadLifter 5000 air bags but the frame brackets on the 5th wheel installation kit part # RP30073 will interfere with the mounting location on the AirLift part # AL57212. Therefore, it is not compatible with the Reese Under Bed Rail Kit part # RP30073 without further modifications that would void the warranty. The only 5th wheel option that will enable you to keep your current airbag setup entails the use of our Reese Universal Base...
    view full answer...

  • B and W Gooseneck Hitch and Firestone Air Bag Kit Recommendation for a 2009 Ford F350 SD
  • I am not sure who you spoke with, but the # F2452 does mount to the outside of the frame rails which is the same place as where the B and W # BWGNRK1108-5W will install. The best solution I can provide would be to go with the # F2550 instead of what you have so that you can install the B and W rails and the Companion # BWRVK3500 because there are no under-bed mount gooseneck hitches that are compatible with # F2452
    view full answer...

  • Maximum Rated Capacity of B&W Companion Slider 5th-Wheel Trailer Hitch Adapter # BWRVK3400
  • The B&W Companion Slider Gooseneck-to-5th-Wheel Trailer Hitch Adapter # BWRVK3400 that you referenced has a maximum rated towing capacity of 20,000-lbs and a maximum rated pin weght capacity of 5000-lbs. Since these are the manufacturer's maximums, there is no exceeding them. We generally recommend using a towing rig that exceeds the actual requirements. For a trailer weighing in at 18K I suggest a hitch rated for 20K to provide a margin of safety. I suggest the B&W hitch # BWRVK3500-5W...
    view full answer...

  • Will Reese Universal 5th Wheel Hitch Base Rails Work with BandW Hitch on Ford Super Duty
  • I show the B and W 5th Wheel Hitch that installs on below bed rails that is a confirmed fit for your 2010 Ford F-250 and F-350 Super Duty is part # BWRVK3500-5W. This setup does have a B and W Fifth Wheel Installation Kit, part # BWGNRK1108-5W. This custom installation kit is required for installation. The Reese universal installation kit for below bed rails # RP30073 is not compatible with this hitch. The linked article on 5th wheel hitch installation may be helpful to you.
    view full answer...

  • Will Reese Revolution Pin Box Work with B&W Companion Hitch for a 2000 Ford F-250
  • The B&W Companion hitches that fit only in the gooseneck ball hole cannot be used with Reese Revolution/Sidewinder pin boxes because the pivot point is locked out at the hitch head. When using a Reese Revolution or Sidewinder style pin box the pivot point is required to be locked out due to the lateral force exerted on the hitch, like the one your referenced # BWGNRK1108-5W, would cause it to rotate in the bed damaging the hitch and install kit. The option that will work for you is the...
    view full answer...

  • Can a 5th Wheel Trailer Hitch and Gooseneck Trailer Hitch be Installed in a 1999 Ford Super Duty
  • Yes, you can put both a 5th wheel hitch and gooseneck hitch in your 1999 Ford Super Duty. If you have a short bed you will need gooseneck hitch and installation kit # BWGNRK1108-5W. Then you can use the B and W companion hitch # BWRVK3400-5W. If you have a long bed you can use the same gooseneck hitch and install kit # BWGNRK1108-5W but the companion 5th wheel hitch you would need is # BWRVK3500-5W. The only other way to tow both types of trailers is to install either a gooseneck...
    view full answer...

  • Will a B&W 5th Wheel Trailer Hitch Fit a 2006 Ford F-350 with Firestone Air Bags 2400
  • Since the B&W installation kit # BWGNRK1108-5W also uses a 3/4 inch bolt in the center hole that Firestone Ride-Rite kit # F2400 uses, and because the hitch brackets mount to the outsides of the frame and the air bag brackets on the insides of the frame, these 2 components will work together. Installation kit # BWGNRK1108-5W is correct for a 2006 Ford F-350 long bed or short bed. Hitch # BWRVK3500-5W is the correct hitch for a long bed. For a short bed use # BWRVK3400-5W. Once the...
    view full answer...

  • Available Underbed Kit For a 2008-10 Ford F350 or F450 Like the OEM Puck System on New Ford Trucks?
  • To start, a puck system/underbed mounting kit is just as safe as the above bed rail systems that are used for 5th wheels and goosenecks. Both the above bed and underbed types of systems are mounted to the frame of the vehicle, they're just done in different manners-both are equally safe, but the difference is mostly down to price. There are a lot of different systems you can use to give yourself a clean truck bed on your new truck. I'll use the 2010 Ford F-350 with an 8-ft bed as an...
    view full answer...

  • Is B&W Companion Compatible With Other Gooseneck Hitches?
  • The B&W Companion mounts in the B&W Turnoverball that doubles as a gooseneck hitch and will not mount on other goosenecks. B&W is a very high-quality hitch and you are right to prefer them but the only way to install a Companion is to remove your current gooseneck and put in the Custom Underbed Installation Kit for B&W Companion # BWGNRK1108-5W and add the Companion Slider # BWRVK3400-5W.
    view full answer...

  • Fifth Wheel Hitch Recommendation for 2008 Ford F-250 Diesel
  • For your 2008 Ford F-250 diesel I really like the B and W Companion hitches like the part # BWRVK3400 for a slider hitch for if you have a short bed truck and part # BWRVK3500 for if you have a long bed truck and don't need a slider hitch. For a rail kit then you'd want the # BWGNRK1108-5W which is a confirmed fit and would work well. What's great about this setup is that when you remove the hitch you'll basically have a totally empty truck bed and then it also doubles as a gooseneck...
    view full answer...

  • Will B&W Patriot 5th Wheel Hitch Provide Enough Turning Clearance in 2004 Ford F-250 Short Bed
  • For a short bed truck like your 2004 Ford F-250 to tow a 5th wheel and still give you reasonable turning clearance you need either a 12-inch sliding hitch like the B&W Companion # BWRVK3400-5W and matching install kit # BWGNRK1108-5W, OR you will need to replace your existing pin box with a Sidewinder pin box and use a fixed hitch. A Sidewinder provides 22-inches of additional turning clearance by moving the pivot point for the trailer back from the hitch head to the rear of the pin box. The...
    view full answer...

  • Is There An Adapter for the Ford Puck System Hitch to Be Compatible With Above Bed Rails?
  • There is an adapter from the Ford factory puck system to standard base rails to make standard 5th wheel hitches compatible with the pucks, but there is not an adapter for the puck system hitch to fit industry standard base rails. For your B&W hitch to work in your 2010 F-350, you would need to use the Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches # BWGNRK1108-5W and then use the Replacement Base for B&W Companion 5th Wheel Trailer Hitch - 20,000 lbs #...
    view full answer...

  • Recommendations for Gooseneck and Fifth Wheel Hitch on 1999 Ford F-350 Short Bed
  • The best option to tow both a gooseneck and 5th-wheel trailer with your 1999 Ford F-350 with 6-3/4 foot bed is to use the B&W Companion 5th Wheel Trailer Hitch w/ Slider # BWRVK3400-5W along with the underbed installation kit # BWGNRK1108-5W. This is a great sliding 5th-wheel hitch that will give you an additional 12 inches of clearance for making sharp turns with your truck's shorter bed. The hitch has a gross towing weight of 20,000 pounds and vertical load limit of 5,000 pounds. The...
    view full answer...

  • 5th Wheel Hitch Needed to Fit with Air Lift LoadLifter 5000 # AL88398 on a 2008 Ford F-250
  • The Under-Bed Rail and Installation Kit # RP30073 may fit with the Air Lift LoadLifter 5000 # AL88398 according to my contact at Air Lift but you may have to do some drilling into the 5th wheel brackets. I don't advise doing this so instead I recommend going with the B&W Gooseneck Kit # BWGNRK1108-5W which already has a hole in the bracket where the bolt from your air bag kit will fit. This will not only allow you to tow a gooseneck trailer, but you can still tow a 5th wheel trailer...
    view full answer...

  • Is a Sliding 5th Wheel Hitch Needed to Tow with a 2007 Ford F-350 Diesel with Short Bed
  • Although some people can make it work, for any pickup with a bed less than 8' we always recommend going with a sliding 5th wheel hitch. This allows you to safely make sharp turns without your 2004 Forest River Cedar Creek making contact with the cab of your 2007 Ford F-350. You actually don't need a capture plate unless your pin box has a rotating turret, like a Sidewinder, or you have an automatic sliding 5th wheel hitch. If you have a normal pin box then no special capture plate is...
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  • Recommended 5th Wheel Hitch for 15K KZ Durango 5th Wheel and 2008 Ford F-350 Diesel
  • Your KZ Durango Gold 384RLT 5th wheel trailer has a GVWR of 14,995-lbs so for a hitch I recommend at least an 18K rating. Safety margin in any item, whether a 5th wheel hitch, winch or jack, tends to mean a longer working life for that item since operating a product below its absolute maximum capacity will usually mean it will operate with less wear and stress. The 6.8L F-350 SRW pickup has plenty of towing capacity for this trailer. Since you have a long bed F-350 you do not need to...
    view full answer...

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Info for this part was:

Video Edited:
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Video Edited:
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Video Edited:
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Written by:
Lindsey S
Expert Research:
Michael H
Expert Research:
Jameson C
Expert Research:
Adam R
Expert Research:
Jeffrey L
Installed by:
Jeff D
Test Fit:
David F
Updated by:
Kristina F

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