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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 # BWGNRK1108-5W
Our Price: $599.00
Fifth Wheel Installation Kit

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Shipping Weight: 95 lbs
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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 fifth wheel installation kit part number BWGNRK1108-5W 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. Fifth Wheel Installation Kit reviews from real customers.
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  • Reviews (30)
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2007 Ford F-250 Super Duty - Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches

  • Below the Bed
  • B and W
  • 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

Installation Details BWGNRK1108-5W Installation instructions

California residents: click here

Customer Satisfaction Score:

Customer Reviews

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

Average Customer Rating:  4.7 out of 5 stars   (30 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.


well worth the money. this hitch is the best that money can buy, best ratings, best safety, best performance hands down. I now have two ways to tow, gooseneck and traditional 5th wheel receiver, and a third if you count the class III rear receiver hitch under the rear bumper. all bases have been covered for me.



its been a year and still going strong. Ive taken many trips and the hitch has held strong and reliable. I couldnt ask for more, except... it is heavy, so removing the base unit to utilize the bed is troublesome if youre removing it yourself like I have to. Simple solution though, I bought a gantry crane so now all i do is drive under the crane, hook up to the hitch and remove with a winch. Easy peasy!


I will update once we open up the boxes but the one box is damaged. Hoping everythin is there. Will update but once my husband opens the box.

Etrailer Expert

Katrina D.


Have you had a chance to check out the product to see if there is any damage?


I have received this package, but have not yet installed it. It was recommended by a reliable friend, and I anticipate it will perform as advertised.

Adam at E-Trailer did an outstanding job confirming the correct package for my truck, arranging delivery, and specifying the other equipment I will need to tow my new trailer. Thank you Adam!

2009 Ford F-250 Super Duty

This is an excellent product. It was recommended to me by more than one person who were both huge fans of it. Installation is a lengthy process. and I had a little trouble with interference with a brake line, but that is nothing against the product itself. Very high quality, and very good instructions for installation. Love how it has so little impact on the usability of the truck bed.


This was a perfect bolt on for my 04 F350 6.0 CCLB I have duals on mine and I had to unbolt the exhaust the whole way up to the transmission crossmember so I had room to drill etc over the driver side tailpipe


One year later, still as solid as when I put it in, no creaks or odd noises. Would recommend if you're on the fence about it.

2003 Ford F-250 Super Duty

I had a short box 2003 F250 with a Hidden Hitch. I wanted to purchase a B&W Companion Sliding Hitch to accommodate the clearance issue between the front of our first 5th wheel camper which was a Palamino Puma 5th wheel and the cab of the truck. The truck had come with a Hidden Hitch goose ball system which I had never used. The salesperson at etrailer informed me that the B&W Companion Slider Hitch would not work with the Hidded Hitch Gooseball set up. I was disappointed to hear this, but I really had no other options. After removing the old Hidden Hitch system and installing the new B&W Gooseball hitch I could not believe how much heavier and substantial this hitch was! I then received and installed the new B&W Companion Slider Hitch. This sliding hitch was the only real option for me and after looking around at other brands of 5th wheel hitches, I know that B&W hitches Made in the USA with their Lifetime Warranty are simply the Best!

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.


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.

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.

Etrailer Expert

Mike L.


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

2001 Ford F-250 Super Duty

Excellent product and service. Really appreciate the install videos.


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


Assistance on live chat to order product was extremely helpful. The hitch and bracket were exactly what was advertised and it was here in record time. Great Experience. I will definitely do business with in the future.

2002 Ford F-250 and F-350 Super Duty

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


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

2000 Ford F-250 and F-350 Super Duty

Not installed but it showed up on time thanks etrailer


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.

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.


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

2001 Ford F-250 and F-350 Super Duty

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



Easy to install & easy to use.




Show More Reviews

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

  • 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...
  • What is the DIfference in The B&W Goosenecks Part # BWGNRK1111 and BWGNRK1108
    The difference in the B&W Turnoverball Underbed Gooseneck Trailer Hitch w/ Custom Installation Kit part # BWGNRK1108 and part # BWGNRK1111 is what vehicles they fit. Part # BWGNRK1108 is designed for the 1999-2010 Ford F-250, F-350 and F-450's and part # BWGNRK1111 is designed for the 2011-2016 Ford F-250, F-350 and F-450's without the OEM Prep Package. Both are designed with the same center section and can be paired with the B&W companion Fifth Wheel with part # BWGNRK1108-5W and part...
    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...
  • 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...
  • Will B and W Turnoverball Rail Kit Fit 2004 Ford F-250 with Air Bag Kit
    Yes, the B and W Turnoverball gooseneck hitch part # BWGNRK1108-5W that fits your 2004 Ford F-250 would fit with the air bag suspension kit you have.
    view full answer...
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  • Can BandW Underbed 5th Wheel Install Kit # BWGNRK1108-5W Fit 2010 F-350 Dually with OEM Bedliner
    If your F-350 OEM bed liner is the drop-in type, then it will have to be trimmed to allow for any 5th wheel installation. Your tonneau cover should pose no issue, however. Spray-on bed liners are compatible with 5th wheel installations but the drop-in type has to be trimmed for installing the BandW Companion hitch # BWRVK3400-5W. Metal-to-metal contact is necessary for safe installation of a 5th wheel. This is covered in the written instructions from BandW, which are attached. This hitch...
    view full answer...
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  • Recommended Fifth Wheel Hitch for 2005 Ford F-350
    For your 2005 Ford F-350 I strongly recommend the B&W Companion # BWRVK3500-5W, which you would mount with the Custom Underbed Installation Kit for B&W Companion # BWGNRK1108-5W, which also doubles as a gooseneck hitch, giving you the best of both worlds. The Companion is considered by many to be the highest-quality fifth wheel hitch available. With nearly 400 reviews from customers who have purchased it, the Companion has gotten a nearly unanimous 5-star rating. It features dual jaws...
    view full answer...
  • Can B&W Turnoverball Gooseneck be Transferred From 2008 to 2015 Ford F-250
    You can absolutely transfer the Center Section for B&W Turnoverball Underbed Gooseneck Hitch # BWGNRC800 from your 2008 Ford F-250 to your 2015 Ford F-250, and you'll just need the new installation kit, which is the rail kit and hardware. The correct part for this is the following: - B&W Turnoverball Gooseneck Custom Installation Kit for Ford # BWGNRM1108 The # BWGNRM1108 has everything you need to install the center section in your 2015 F-250, and everything will indeed work just fine.
    view full answer...
  • Air Lift Air Bag Kit that Fits 2002 Ford F-350 with B and W Turnoverball 5th Wheel Rail Kit
    Yes, the Air Lift LoadLifter 5000 part # AL88291 is a confirmed fit for your 2002 Ford F-350 with the B and W Turnoverball hitch # BWGNRK1108-5W. It was designed to work with this rail kit actually.
    view full answer...
  • Recommended Under-Bed 5th Wheel Rails And 5th Wheel Hitch For 2009 Ford F-250 w/ 8 Bed
    Absolutely! Starting with the under-bed rails I highly recommend the Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches # BWGNRK1108-5W which is actually a gooseneck hitch but allows you to mount select 5th wheel hitches and is the best option for under bed rails currently available. Now for a 5th wheel hitch I recommend B&W Companion 5th Wheel Trailer Hitch - Dual Jaw - 20,000 lbs # BWRVK3500-5W which has a 20000lb weight capacity, and has the premium features...
    view full answer...
  • Fifth Wheel Hitch for B&W Turnoverball Gooseneck Rails in 2008 Ford F-350
    The B&W Turnoverball Gooseneck # BWGNRK1108-5W also serves as the underbed rails for the B&W Companion and does not fit other fifth wheel hitches. Don't let the lack of options dissuade you though because this is the fifth wheel hitch I would recommend for you even if you did not already have the base rails because the Companion is considered by many to be the highest-quality fifth wheel hitch available and height should not be an issue because it can adjust from between 16-1/4" to 18-1/4"....
    view full answer...
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  • Will the Convert-A-Ball Adapter Work w/ a B&W Gooseneck Hitch?
    Yes, it will. The Convert-A-Ball Cushioned 5th-Wheel-to-Gooseneck Adapter item # CAB-C5G is compatible with the B&W Custom Underbed Installation Kit item # BWGNRK1108-5W. This kit is custom fit for your 2008 Ford F-250.
    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...
  • 5th wheel puck/goose neck system for 2000 f350- WHAT KIND OF AIRBAGS?
    I have a solution for you, but unfortunately there is not an aftermarket combination Gooseneck hitch and puck system mounting kit available for your 2000 Ford F-350. Additionally, without knowing which air bag system you have installed, it's tough to confirm what will be compatible. With that being said, the best way to tow a 5th wheel and also have a gooseneck hitch available in your truck is by using the B&W Custom Underbed Installation Kit # BWGNRK1108-5W paired with the B&W Companion...
    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...
  • Underbed 5th Wheel & Gooseneck For 2008 Ford F-350 Super Duty
    There is one option for you to replace your current underbed rails so you can tow a 5th wheel and a gooseneck trailer with your 2008 Ford F-350 Super Duty. What you'd have to get is the B&W Turnoverball Gooseneck and the Companion 5th wheel hitch: - B&W Companion 5th Wheel Trailer Hitch # BWRVK3500-5W - Turnoverball Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches # BWGNRK1108-5W Though the product title says custom underbed installation kit, this is the Turnoverball...
    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...
  • 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 example...
    view full answer...
  • Firestone Air Bag Recommendation for 2008 Ford F-350 with B&W Companion 5th Wheel Trailer Hitch
    The B&W Companion 5th Wheel Trailer Hitch, # BWGNRK1108-5W, mounts to the outside of the frame on the 2008 Ford F-350. The Firestone Ride-Rite Air Helper Springs, # F2550, mount to the inside of the frame so these air bags can be used in conjunction with the B&W Companion 5th Wheel Trailer Hitch, # BWGNRK1108-5W.
    view full answer...
  • 5th Wheel Base Rail Adapter for Use with B&W Turnoverball Gooseneck Hitch in 2008 Ford F-450
    If you have a B&W Turnoverball gooseneck hitch/5th wheel install kit # BWGNRK1108-5W in your 2008 Ford F-450 Super Duty you can install an industry-standard 5th wheel hitch like your Reese 16K by adding an adapter. Curt makes their X5 5th Wheel Base Rail Adapter # 16310 for this purpose. The X5 drops right in to your B&W turnoverball hitch and provides the equivalent of ISRs ( industry-standard rails) that will accept any brand of 5th wheel hitch designed for ISRs. if you need a wiring...
    view full answer...
  • Difference Between B&W BWGNRK1108 and BWGNRK1108-5W Turnover Ball Gooseneck Hitch
    There is no difference between the two. We have two similar but different part numbers because we market the # BWGNRK1108 as a gooseneck hitch and the # BWGNRK1108-5W as the mount for the # BWRVK3400 sliding version of the B&W Companion 5th wheel hitch for short bed trucks or # BWRVK3500 for long bed trucks. By having two different part numbers for the identical part, the hitch is easier to Google search for. If you'd like to install a 7-way trailer connector in the truck bed so you...
    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 or 5th...
    view full answer...
  • B and W Fifth Wheel and Hitch Recommendation for a 2008 Ford F250
    The two part numbers you referenced are the same thing. We have slightly different part numbers for the two to designate how each is found through our fitguides. The part numbers # BWRVK3500 and # BWRVK3500-5W both give you the same hitch designed to fit the B and W turnover rail kits. For your 2008 Ford F250 you would also need the part # BWGNRK1108-5W.
    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...

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

Info for this part was:

Employee Zack K
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Employee Chris R
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Employee Lindsey S
Written by:
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Employee Michael H
Expert Research:
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Jameson C
Employee Adam R
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Adam R
Employee Jeffrey L
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Employee Jeff D
Installed by:
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Employee Wilson B
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