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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 # BWGNRK1012-5W
Our Price: $599.00
Fifth Wheel 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 fifth wheel installation kit part number BWGNRK1012-5W 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 (26)
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B and W Fifth Wheel Installation Kit - BWGNRK1012-5W

  • Below the Bed
  • Custom
  • B and W

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).

GNRM1012 B and W Turn Over Ball Under-Bed Rail Kit

GNRC912 B and W Turn Over Ball Center Section

Installation Details BWGNRK1012-5W Installation instructions

This Product Fits The Following Vehicles

California residents: click here

Customer Satisfaction Score:

Customer Reviews

Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches - BWGNRK1012-5W

Average Customer Rating:  4.8 out of 5 stars   (26 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.


The B&W under bed hitch along with the Fifth wheel companion hitch took the better part of the morning to assembly & install but was a great fit and great quality. Thank you etrailer for your help with my order and your fast shipping.
Thanks again

Joe B.


I pull a 19,000 Fuzion 429 toy hauler &amp it works great


The hitch came in like promised installed, took me about four hours. Instructions were really great. These guys at really helps. You decide which one to get for your vehicle. Prices were really good. Give these guys a try.


Definitely like this setup. Granted for a 65 year old it was little tough getting to putting in all the bolts. Having a car lift would have helped, but did not have one in my shop . Installed totally by myself, lost a washed down by fuel take and they were able to send another one out to me. Great with the Companion Fifth wheel hitch. Have been pulling my 43ft and 18,000lbs fifth wheel for a year now. No problems encountered with this set up. Would go with this set-up time and time again!! Highly recommend.

Steve C.


Been in for 2years now, no regrets, Would by again!!


My order came quicker than expected and installation videos from etrailer made the install a breeze. I would highly recommend B&W from etrailer.

2017 Ram 2500

I couldn’t be more happy with this hitch, it works perfect each and every time. The installation was not bad either for my 2013 Chevrolet 2500. I would definitely recommend this hitch to anyone who’s looking. I recently installed a different brand hitch in a friend of mines 2017 f350, as I’m working on this I’m thinking to myself I’m so glad I didn’t buy this kind. Overall b&w in my opinion is the best choice on the market today.

Chevrolet Silverado 2500

Excellent product installed my self in a chevy 2500 hd. Instruction were easy to follow and precise. Really like the fact that when I take my rail out you gain the whole bed of your truck back. No pins sticking up just a flat bed won't know you were able to put a 5 th whelk hick and rain in there. Only complaint is because the hitch that attached to this frame is rated at 2k its is heavy to lift when removing. But if you have a chain host and a couple straps and can back under, the problem is solved and can be done by one man.

2015 Chevrolet Silverado 2500

Quality hitch, Made In The USA. Installation wasn't bad, the video on etrailer's page was a big help.

Mark R.


Works great


Have always depended on B&W hitches. Is a bit technical on self install, but if you have the tools and time, it can be done.


Received the the product ahead of schedule. Installation was simple with the provided instructions. Hardest part was raising my fuel transfer tank.

2015 Chevrolet Silverado 2500

Was missing parts and powder coat flaking off. etrailer only sent missing parts after 4 phone calls and told me I had to repaint.

2015 Chevrolet Silverado 3500

Great product and etrailer is a great store to buy from. Very fast shipping and also helpful install videos.


Installed quickly and the instructions were easy to follow. Definitely satisfied with my purchase.


It is a great hitch and goose neck. This is my second one. My first truck was wrecked with it in it.


Great product! Very easy to understand instructions.


It worked as advertised a quality product I have had serveral comments as to how good it looks



It works great


Great hitch


Quick deliver, Excellent communication. Looks great on the truck!


Fits perfectly and the directions are i mpeccable.


Currently having this installed. Service and shipping was fast and great!


Great price and fast delivery will recommend to friends and family

2015 GMC Sierra 3500

Everything looks good



2015 Chevrolet Silverado 2500

2012 Chevrolet Silverado


Show More Reviews

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

  • 2013 Chevy Silverado 2500 6.5 Bed Puck System Recommendations
    I do have a few options for you to add an underbed kit on your 2013 Chevy Silverado 2500 6-1/2' bed and the real differential is the style you are looking for. For a true 4-point puck system you need the Elite Series Under-Bed Gooseneck Hitch # RP30158-68. This is closer to the OEM puck system style for your truck and you will need the Rail Adapter # RP30156 to connect your 16K Husky slider to this system. I personally like this system best because it gives you a wider variety of options. We...
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  • B&W Gooseneck and Companion Hitch Fitment for a 2015 GMC Sierra 2500
    Yes, the B&W Companion # BWRVK3400, which uses the Base # BWRVB3405 you referenced, will fit the Custom Underbed Installation Kit # BWGNRK1012-5W for your 2015 GMC Sierra 2500. This is one of my favorite towing setups because you gain the ability to tow either a 5th wheel or gooseneck trailer, the installation looks really clean, and it's all made here in the USA! The only other thing I recommend checking out if you don't already have it is a 7-Way wiring kit for your truck bed. Installing...
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  • B&W Companion Sliding 5th Wheel Hitch That Fits 2013 Chevy Silverado 2500 With Turnoverball
    So long as the B&W gooseneck you have on your 2013 Chevy Silverado 2500 is the Turnoverball Gooseneck # BWGNRK1012-5W, then yes, you absolutely have the correct B&W Companion sliding 5th wheel hitch for your Chevy, which is the following: - B&W Companion 5th Wheel Trailer Hitch with Slider # BWRVK3400-5W This will mount directly in the square gooseneck hole of the Turnoverball gooseneck, and is a fantastic choice for a hitch. It is considered by many to be the best 5th wheel hitch available...
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  • Location of B&W 5th Wheel Hitch in Relation to Rear Axle 2013 Chevy Silverado 2500HD Short Bed
    When the B and W installation kit # BWGNRK1012-5W is installed for the Companion hitch, the center of the ball hole will be 44-3/4 inches forward of the rear edge of the bed on your 2013 Chevy Silverado 2500HD short bed. This will tell you where the center of the hitch will be once installed. Companion hitch # BWRVK3400-5W and # BWRVK3400 are sliders. They have 12 inches of travel allowing you to making tighter turns unlike the fixed hitch version that allows you to move the head further...
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  • Fifth Wheel Hitch Recommendation to Fit 2012 Chevy Silverado with B and W Turnoverball Hitch
    Sounds like your 2012 Chevy Silverado 3500 has a B and W Turnoverball hitch part # BWGNRK1012-5W installed in it and you need the B and W Companion Hitch part # BWRVK3500-5W.
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  • Is Weight Capacity of 5th Wheel/Gooseneck Towing Higher Than Bumper Towing for a 2015 Sierra 2500
    According to my research the weight ratings your found for your 2015 GMC Sierra 2500HD Duramax Crew Cab 4WD are correct but it is always a good idea to confirm this with your copy of the owner's manual. Since 5th wheel or gooseneck towing places the tongue weight (or pin weight) of the trailer almost directly on top of the rear axle it is extremely common to see higher weight ratings for 5th wheel/gooseneck towing than bumper pull towing. If you'd like to tow a 5th wheel/gooseneck trailer...
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  • Best Fifth Wheel Hitch Recommendation for a 2015 Chevy Silverado 2500 Short Bed
    The Companion hitches are great fifth wheel hitches. If you do any amount of searching online for the best fifth wheel hitch nearly everyone agrees that the Companion hitches are just that. Since you have a short bed hitch the part # BWRVK3400-5W would be exactly what you would need to make tight turns. For a rail kit that would also double as a gooseneck hitch you would need the Turnover hitch part # BWGNRK1012-5W confirmed to fit your truck. The height of the hitch will be adjustable...
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  • Recommended B&W Companion Hitch and Installation Kit for a 2015 Chevy Silverado 3500
    I have a solution for you but the B&W Companion OEM 5th Wheel Hitch for Chevy/GMC Towing Prep Package item # BWRVK3715 doesn't fit the Chevy trucks before 2020 that don't have the puck system in the bed. The first year of the GM Towing Prep Package was in 2016. To add a Companion 5th wheel hitch to your Silverado 3500 you will need the Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches item # BWGNRK1012-5W. This fits both the 6-1/2' bed or 8' beds. The only restriction...
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  • Recommended B&W Turnoverball Underbed Gooseneck Hitch for a 2011 GMC Sierra 2500HD
    To add a gooseneck hitch to your 2011 GMC Sierra 2500, you will want the B&W Turnoverball Underbed Gooseneck Hitch item # BWGNRK1012. This hitch is custom fit and includes all hardware necessary to complete installation on your truck. It fits both the diesel and gas engine models along with both the 6-3/4' and 8' bed lengths. It has a massive 30,000 lbs capacity. I have linked an installation video below to help you get it set up. To make towing with a gooseneck trailer easier I recommend...
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  • Is There an Aftermarket GM Prep Package Available for a 2012 Chevrolet Silverado 2500
    The under bed puck systems are actually going to attach to the frame so the key thing here is the 2012 Chevrolet Silverado 2500 frame. I have a couple options for you depending on what you have going on in your truck bed already. If you do not already have holes in your bed for the prep system but instead just have the indentions where the holes would go then I recommend the Under-Bed Rail and Installation Kit for Reese Elite Series 5th Wheel Trailer Hitches # RP30868. This is not going...
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  • Dimensions of B&W Companion Sliding Fifth Wheel Hitch on 2015 Chevy Silverado 2500
    I have the dimensions you are looking for on the B&W Companion # BWRVK3400-5W, which you install in your 2015 Chevy Silverado 2500 with Custom Underbed Installation Kit # BWGNRK1012-5W. According to B&W, the Companion slider measures 15" from the the center of the hitch post to the cab-side of the hitch and 30" to the tailgate side. Overall, this hitch measures 34-3/4" wide and 45" deep. I've added a video of the rails being installed on a 2015 Silverado 2500 as well as a video review...
    view full answer...
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  • Underbed 5th Wheel Trailer Hitch and Install Kits for a 2015 GMC Sierra 2500
    You can install a 5th wheel hitch in your truck BUT Curt Q20 5th Wheel Trailer Hitch # C16671 was designed for Chevy/GMC trucks that came with the factory 5th wheel prep package. This package was not available on the 2015 model year GMC Sierra 2500. It wasn't available as an option until the 2016 model year. For an underbed system that is like the factory prep package you can use one of the following set ups: Reese install kit # RP30868 with hitch # BWRVK3370 B&W kit # BWGNRK1012-5W,...
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  • Best 5th Wheel Trailer Hitch for Towing with a 2015 GMC Sierra 3500 that has an 8 Foot Bed
    With an 8 foot bed you're not likely to have any issues with turning clearance. I recommend using the B&W Companion # BWRVK3500-5W. It's one of the favorites because of how solid it is. It has dual jaws and pivoting head to improve your trailer's ride. It also installs into an underbed kit, # BWGNRK1012-5W, that's also a gooseneck hitch if you ever need it. For a more economical option the Curt # C16245 is the most popular for your 2015 GMC Sierra 3500. It also has a dual jaw but...
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  • Recommended Sliding Hitch For 2013 Silverado 2500 Short Bed With B&W Turnoverball Gooseneck
    The best option in your 2013 Silverado 2500 HD Short Bed with B&W Gooseneck # BWGNRK1012-5W is the B&W Companion 5th Wheel Trailer Hitch w/ Slider - Dual Jaw - 20,000 lbs # BWRVK3400-5W hands down. This is one of the best systems on the market and by far the best for a gooseneck adapter. This is the best underbed gooseneck system with the best adapter from gooseneck to 5th wheel. The quality, capacity, and easy of use are unmatched, which gives it a slightly higher pricepoint. If...
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  • Recommended 5th Wheel Hitch and Mounting Kit for 2014 Chevy Silverado 2500
    We've got just what you're looking for to tow a 5th wheel trailer with your 2014 Chevy Silverado 2500. The best solution would to a kit that provides you with an underbed mounting kit since it allows you to have a clean truckbed when your hitch is not installed. I recommend using the Custom Underbed Installation Kit for B&W Companion 5th Wheel Trailer Hitches # BWGNRK1012-5W. This will kit will allow you to use the B&W Companion Sliding 5th Wheel Hitch # BWRVK3400-5W, which is my recommendation...
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  • 5th Wheel Trailer Hitch Made in the USA for a 2013 Chevy Silverado 2500HD Short Bed
    For a 5th wheel hitch set up that is made here in the states B&W still manufacturers hitches in the USA. If you wanted to go that route you would need installation kit # BWGNRK1012-5W and Companion hitch # BWRVK3400-5W for your 2013 Chevy Silverado 2500HD short bed. I have included links to videos on the hitch and installation of the rail kit. The benefit of going with the B&W set up is that you get a gooseneck hitch built into the installation kit so if you ever needed to tow a gooseneck...
    view full answer...
  • B&W Companion 5th Wheel Hitch Fit for 2013 Chevy Silverado 3500
    We do have the exact parts you need to install a B&W Companion 5th wheel hitch in your 2013 Chevy Silverado 3500. You didn't mention the size of your bed so I'll list the options for the fixed hitch if your Silverado is a long bed and the sliding version if you have a short bed. - Sliding Hitch: B&W Companion 5th Wheel Trailer Hitch with Slider # BWRVK3400-5W - Fixed Hitch: B&W Companion 5th Wheel Trailer Hitch # BWRVK3500-5W To mount either hitch in your 2013 Silverado 3500 you need...
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  • 5th Wheel Trailer Hitch and Installation Kits for a 2015 Chevy Silverado 2500
    I will be happy to make some recommendations for your 2015 Chevy Silverado 2500. If the truck is a short bed then I recommend custom underbed mount kit # DM8551010 with the 21,000 pound rated auto-sliding HiJacker, # DM8550037. The underbed mount means that the bed will be clear when the hitch is removed for a clean look and a bed free of obstructions. The hitches slide automatically so you won't have to get out of the truck. And they travel 14 inches, the most of any slider we have, for...
    view full answer...
  • Formula to Determine Turning Clerance With Sliding Hitch on 2015 Chevy Silverado 2500
    If you have the sliding B&W Companion # BWRVK3400-5W mounted to the B&W Turnoverball # BWRVK3400-5W on your 2015 Chevy Silverado 2500HD there is a formula you will need to use to determine if you will have the necessary clearance to make a 90 degree turn so your trailer won't hit the cab. (A + B) - C = Clearance A = Distance from center of 5th-wheel hitch jaw to truck cab in inches B = Offset used (slider clearance, which in this case is 12" front to back) C = Width of trailer in inches...
    view full answer...
  • Recommended 5th Wheel and Gooseneck Trailer Hitches in a 2015 GMC 2500 with 6-1/2 Foot Bed
    The best way to have both a gooseneck and fifth wheel hitch in your 2015 GMC Sierra 2500 is a B&W Companion. The Companion installs using an underbed gooseneck hitch # BWGNRK1012-5W that has a turnoverball so you'll have a clear truck bed. In addition the Companion # BWRVK3400-5W is a fifth wheel trailer hitch that fits into the gooseneck so you can tow a fifth wheel trailer. This is a sliding hitch to help with turning clearance since you have a short bed truck. I've linked a video...
    view full answer...
  • Fender Lining Trimming Required to Install B and W Underbed Gooseneck Hitch
    In the installation instructions for the B and W Companion Rail Kit part # BWGNRK1012-5W that you referenced it states that some trimming of fender liners can be required. If you check out the install video that I attached around the 1:15 mark we show how to remove the fender liner so that the hitch can be installed. You'll notice that at the end of the video the handle for the hitch hangs lower than the fender liner so it didn't need to be trimmed. The vehicle in this video is a 2015...
    view full answer...
  • Best 5th Wheel Hitch for a 2015 Chevrolet Silverado 2500 with 8 Foot Bed
    The best 5th wheel hitch we have for your 2015 Chevrolet Silverado 2500 with an 8' bed is the B&W Companion 5th Wheel Trailer Hitch part # BWRVK3500-5W with the Custom Underbed Turnoverball Installation Kit part # BWGNRK1012-5W. This setup is unique in that it provides you with a connection point for both 5th wheel and gooseneck trailers. The Companion hitch has 1" thick dual locking jaws that are going to do a phenomenal job of keeping the kingpin secure which in turn reduces chucking...
    view full answer...
  • Can B&W Flatbed Companion Work on 2014 GMC Sierra 3500
    The B&W Companion Flatbed 5th Wheel Hitch # BWRVK3050 that you referenced will mount to your 2014 Sierra 3500 as long as you have a B&W Turnoverball Gooseneck Hitch installed. For the Turnoverball hitch that is confirmed to fit your truck you can use # BWGNRK1012-5W. If you do have a flatbed truck you will want the Turnoverball # BWGNRK1500 instead. It is important to note that the Flatbed Companion will sit very low on your truck bed (10-1/2 inches from the bed to the top of the hitch)....
    view full answer...
  • Gooseneck and 5th Wheel Hitch Setup Recommendation for 2015 GMC Sierra 3500 6-1/2-Foot Bed
    To equip your 2015 GMC Sierra 3500 with 6-1/2-foot bed for both gooseneck and 5th wheel towing I suggest you go with the B&W system. Gooseneck hitch and install kit # BWGNRK1012-5W will install in your 3500 without frame drilling. The linked video shows the installation process in a 2015 3500. You can then add their Companion sliding hitch # BWRVK3400-5W and wiring harness # C56000 to complete the 5th wheel setup. This system will allow you to easily switch from gooseneck to 5th wheel...
    view full answer...

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