bing tracking image
  1. 5th Wheel Gooseneck Adapter
  2. Demco
  3. Gooseneck Hitch to Fifth Wheel Trailer
  4. Connects to Gooseneck Hole
  5. Hitch Adapters
  6. Adapts Truck
Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches
Demco

Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches

Part Number: DM6140
In Stock
$649.00
Retail:$767.00
You Save: $118.00
5th Wheel Gooseneck Adapter
Add to cart
zoom in icon
slider vertical icon
zoom out icon
Comment field cannot be left empty.
Name field cannot be left empty.

Thank you! Your comment has been submitted successfully. You should be able to view your question/comment here within a few days.

Error submitting comment. Please try again momentarily.

Product Images

In Use/Installed

Customer Photos

Need help with installation?
Locate installers near me
Install this adapter in the ball hole of your B&W Turnoverball gooseneck hitch to get above-bed base rails for your fifth-wheel trailer hitch. Universal rails provide attachment points in your truck bed for a standard fifth-wheel hitch. 1-800-940-8924 to order Demco 5th wheel gooseneck adapter part number DM6140 or order online at etrailer.com. Free expert support on all Demco products. Great prices and Fastest Shipping for Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches. 5th Wheel Gooseneck Adapter reviews from real customers.
  • All Info
  • Reviews (73)
  • Q & A (0)
  • Photos

Demco 5th Wheel Gooseneck Adapter - DM6140

  • Gooseneck Hitch to Fifth Wheel Trailer
  • Connects to Gooseneck Hole
  • Hitch Adapters
  • Demco
  • Adapts Truck
  • No Offset
  • Fixed Height

Install this adapter in the ball hole of your B&W Turnoverball gooseneck hitch to get above-bed base rails for your fifth-wheel trailer hitch. Universal rails provide attachment points in your truck bed for a standard fifth-wheel hitch.


Features:

  • Adapter mounts in your gooseneck trailer hitch to supply the above-bed base rails necessary for installing a 5th-wheel hitch
    • Works with B&W Turnoverball gooseneck trailer hitches
    • Compatible with Demco Hijacker Premier Series, B&W, Curt, Draw-Tite, Hidden Hitch, Husky, Reese, and Valley above-bed 5th-wheel trailer hitches
  • Adjustable mount allows for bed mats and liners
  • Fast, easy installation
    • Drop adapter into gooseneck ball hole and lock in place
  • Sturdy, black powder coated steel resists corrosion
  • Made in the USA
  • 5-Year limited warranty


Specs:

  • Gross towing weight: 21,000 lbs
  • Vertical load limit: 5,250 lbs


Notes:

  • Do not use this adapter with the Demco Hijacker Autoslide hitch or any other automatic sliding fifth-wheel trailer hitch.
  • Do not use this adapter with a B & W Patriot slider fifth-wheel hitch.
  • Demco Hijacker 5th-wheel hitches manufactured before 2012 do not fit industry standard universal rails.
  • When using this adapter, you may have to remove the safety chain loops from your gooseneck hitch if they are mounted front/back rather than side to side.


6140 Demco Base Rails w/ B&W Ball Adapter for 5th Wheel Trailer Hitches

Installation Details DM6140 Installation instructions



Customer Satisfaction Score:


Customer Reviews

Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches - DM6140

Average Customer Rating:  4.8 out of 5 stars   (73 Customer Reviews)

Install this adapter in the ball hole of your B&W Turnoverball gooseneck hitch to get above-bed base rails for your fifth-wheel trailer hitch. Universal rails provide attachment points in your truck bed for a standard fifth-wheel hitch.

by:

Great option for my curt q20 took 20 minutes to install .I bought a new truck which came with the b&W gooseneck hitch i was surprised to find this plate . Thanks etrailer



by:

This product is spot on, I installed it immediately and have used it twice. This product was an awesome option to purchase because of already having the B&W turnover ball system. This gave me the ability to install and the Curt Q24 slider to give the maneuverability needed when pulling a fifth wheel with a short box that the Anderson hitch did not provide. I have already used the slider option twice, it works flawlessly. Prior to the purchase of this Demco I purchased the Curt X5. The X5 did not work with my truck at all. The X5 did not even make contact with the bed of the truck for support. This Demco base to rails fits tightly to the bed of the truck. I have 2007 Dodge 3500. It is a short box mega cab.



by:

the Base rails work good but I gave it a average rating because the shipping was terrible, It looked used when I received it, the cardboard was about gone when I received it. It was dropped many times, the edges were rolled over from being dropped and the paint was very scratched.



by:

Does exactly what is is built to do. I pull a 42’ fifthwheel that weighs 18000# with no hesitation anywhere. As always very happy with product and ther staff at etrailer. I will continue to use you for all my needs. Thank



by:

I like this adapter. It drops right in to where my turn over ball goes, secures just like the turn over ball with one added bolt for extra security, and the the hitch mounts to it. It is easily removed so that I can still quickly utilize a goose neck with my turn over ball. I rate this model a 4 star as it only works with 2 widths of hitches. My original hitch did not work but bought one that did. The 2 sizes are relatively common sizes. I recommend this for those that do not want to remove their turn over ball hitches and want a quick and easy way to move from 5th wheel to gooseneck connection.



by:

It works like it should it was quick to arrive even though it weighs a lot and shipping was free. I like shopping at etrailer, they work hard to make sure everything is right and will work for my situation. They put so much information about the items they are selling so you can be confident in what you’re buying, unlike Amazon where so much of that information is so vague.



by:

Easy to install. Delivery was timely. Everyone at etrailer and Demco were awesome to deal with.



by:

I ordered the wheelbase rails to go with my new hitch, and when I received it, the large washer was missing that secured the rails. I contacted Paul at e trailer, and he immediately took great care of me.



by:

Super fast ship works as stated, so nice to have an install video to watch.



by:

Robert in customer service answered my questions about the product and took my order. Arrived in 2 days as stated with no packaging issues. Had it installed in 30 minutes or less after reading instructions and them mounted 5th wheel hitch to it. Installation was straightforward. As there is a torque specs for adjustment/lock bolt I
suggest having torque wrench availiable for proper installation. Only reason for not giving a 5 star rating is have not pulled 5th wheel rv yet to see if it has any slack



by:

Great customer service and quick delivery. Fits perfectly in my B&W turnover gooseneck hitch!

Tim P.

9/15/2021

Perfect solution for me! Easy to install and remove when not needed. It doesnt move around when towing. Im very pleased with the performance and price.



by:

This is my second adapter. I tried the Curt X5 first and had problems with it fitting. But etrailer worked dilligently with me to find a solution. Ultimately refunding my money on the X5 and suggesting this Demco product. It fit and worked perfectly in my truck. Thanks etrailer for your help.

Jeff B.

12/21/2017

Perfectly. One of the best purchases and customer experiences I’ve had. Thanks you etrailer.



by:

This adapter plate when used with the B&W turnover ball hitch allows me to use a gooseneck trailer, fifth wheel trailer, and also use a truck camper. My original Fifth wheel bed rails were interfering with installation of a truck bed camper and this eliminates that problem. Installation is very fast and only requires torquing of the single center bolt after placing the adapter lug into the socket. I had zero problems installing this unit and it only takes about a minute to do. Also the paint job is very durable.



by:

This hitch mount is great! I can now swap over from my 5th wheel hitch to a gooseneck in minutes. This is a great product. I had a gooseneck hitch already installed in my pick up but needed to tow my 29 foot 5th wheel. I other mounts to install the 5the wheel to my 2013 Ram but the gooseneck hitch mount was in the way. Found this set up on line at etrailer.com . Fast shipping, Ez to get my order in. 100 % satisfied. Plug and play. Took less than 10 minutes to install.



by:

This product worked great. Used it in a 2016 Ram 2500 4x4 with the B&W turnover ball. The only problem is the safety chains for the B&W wont let this set flat against the bed of the truck. I solved this problem by using a heavy duty 1/4 inch rubber bed mat between the bed and this bracket and cut the rubber around the B&W hole and safety chains. That helped take up the extra space and helped to protect the spray in bed liner from being rubbed. Had no problems towing my fifth wheel and was happy I don't have these rails permanently mounted in my truck bed.



by:

I am fairly unhappy with the fact that I can not use this 5th wheel rail system with my b and w gooseneck chain hooks installed. I have to unbolt the chain hooks to get the rails flush in the bed. I specifically asked if this was compatible with my set up prior to order. Pretty upset that it turned out different than what I was told. The rails are nice, but I did not want to have to modify my set up each time I want to hook up a gooseneck trailer. Hopefully this will help others in their research.



by:

When my truck came with a gooseneck hitch, I didn't want to get an adapter for the trailer. This adapter fit perfectly and allows me to mount my fifth wheel hitch to the truck and remove it when I'm not using it. The hitch and adapter together are REALLY heavy; it'll take a forklift or 2 or 3 strong people to take it out.



by:

Fantastic product and fantastic service. I ordered on Monday and received at noon on Wednesday.



by:

Fantastic product, perfect fit both in the turnover gooseneck and the rails for my plate , easy install but do wish they'd cut slots in for the safety chain u-bolts as I had to remove those to make it sit flush.



by:

Heavy and Built like a tank. One to three people will be needed in installing, one or two people to place in the flip over receiver and one person to pull the locking pin. Direct fit for the Demco Recon fifth wheel hitch.
Very well packed with all necessary parts securely attached to item.



by:

It works perfectly with my B&W turnover hitch and Reese 20k 5th wheel hitch.



by:

Quick and Easy to install holds up good just pulled my fithwheel back from Louisiana to the house in Alabama running 70/80 the whole way held up good no slack in it the only thing I wish was a lil deff is when I go from gooseneck ball to hitch I have to remove my safety chain loops out of my bed so it allows a flush mount but that’s about it overall a great product



by:

The adapter works great, it alow me to pull gooseneck trailers and my fifth wheel and still have a totally flat floor to carry cargo in the bed.



by:

The adator I purchased is a great piece of engineering. Instalation was very easy. I am very happy with it so far. Have not towed my 5th wheel yet but will soon.
The only thing I can suggest to etrailer is the packaging. The cardboard box was broken open on one side and retaped. In a few places the paint was chipped off. I repainted the chips before installation so they will not rust.



by:

Gooseneck adapter has worked out fine. I pull a 20,000 pound trailer no problem.


25
73
Show More Reviews

See what our Experts say about this Demco 5th Wheel Gooseneck Adapter

  • Gooseneck & 5TH Wheel Hitch Systems Compatible With Air Bag Springs On 2022 F-350 Single Rear Wheels
    Yes, you are able to use the different parts together on your 2022 Ford F-350. First you will start with the B&W Turnoverball Underbed Gooseneck Trailer Hitch # BWGNRK1116. Since you have a short bed truck you may also want the 4" Offset Ball # BWGNXA4085 to gain you some additional turning clearance. While you are able to use the Demco 5th Wheel Base Rails Adapter # DM6140 with the Andersen Ultimate Connection 5th Wheel Trailer Hitch # AM3200 a better option is to use the B&W Companion...
    view full answer...
  • 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...
    view full answer...
    Image 1 for
  • Demco 5th Wheel Adapter for Ford Puck System
    The Demco Slider will work in your 2019 Ford F-450 Super Duty but you will need the Demco 5th Wheel Rail Adapter for Ford OEM 5th Wheel Towing Prep Package - 25,000 lbs item # DM6175. This will allow you to attach your slider to the different puck system that is in the F-450. Chevy uses a different system.
    view full answer...
  • Recommended Flush Mount 5TH Wheel Hitch Attachment Points For a 2019 GMC Sierra 1500
    I have a couple recommendations for you that will depend on your bed length for your 2019 GMC Sierra 1500 and there is not a puck system style mount for your truck. First if you have a 5-1/2' or 6-1/2' bed I recommend the Demco UMS Underbed Rail and Installation Kit # DM8551011. This will provide 4 mounting points under the bed similar to the factory style puck systems. This will require you to use the Demco UMS series hitches or adapters. I recommend using the Demco Autoslide 5th Wheel...
    view full answer...
  • Recommended 5th Wheel Hitch Base Rail Adapter for B&W Square Gooseneck Hitch
    Congrats on the new truck! To use your Curt A16 5th Wheel Hitch item # C16521 with a B&W Turnover Ball System you will need the Demco 5th Wheel Base Rails Adapter item # DM6140. This adapter will drop down into the square receiver and provide you with a set of industry standard rails. This adapter is made in the USA and has a 21,000 lbs capacity. If you have a bed liner you may need to cut into it depending on the thickness to get the adapter to sit all the way inside the receiver. I...
    view full answer...
    Image 1 for Image 2 for
  • How to Add Base Rails to 2001 Ford F-250 With B&W Gooseneck Hitch Installed
    The best way to add rails to your 2001 F-250 is the Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches # DM6140. This drops into the B&W Turnoverball gooseneck hitch giving you industry standard rails. There are some limitations, mostly pertaining to sliding hitches, which I will add below. Do not use this adapter with the Demco Hijacker Autoslide hitch or any other automatic sliding fifth-wheel trailer hitch. Do not use this adapter with a B & W Patriot slider fifth-wheel...
    view full answer...
  • 5TH Wheel Hitches Compatible With B&W Turnover Ball Gooseneck Hitch On a 2005 Ford F-350
    If your 2005 Ford F-350 already has the B&W Turnoverball Underbed Gooseneck Trailer Hitch # BWGNRK1108 you will not be able to install the B&W Custom Installation Kit w/ Base Rails # BWRVK2400 as the mounting brackets will not fit with the other brackets still on. Luckily we have the B&W Companion 5th Wheel Trailer Hitch # BWRVK3500 and Slider # BWRVK3400 that will drop into the square shank and give you a 5th wheel hitch without needing a Rail Adapter # DM6140. The instructions for...
    view full answer...
  • Sliding 5th Wheel Hitch to Fit B&W Turnoverball Gooseneck Hitch
    The only way to know how heavy a hitch you need is to find the trailer's gross vehicle weight rating (GVWR) which is its maximum weight when fully loaded. There's likely a tag on the trailer that states the GVWR, or it may say on the trailer's documentation. You may also be able to contact the trailer manufacturer with the VIN to find its specs from when it was built. As a last resort you can load the trailer and weigh it. Of course this requires you to get it to a scale and you still...
    view full answer...
  • Is Demco 5th Wheel Adapter # DM6140 Compatible with Draw Tite Fifth Wheel Hitch
    The Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches # DM6140 that you referenced is designed to provide the exact style of fifth wheel rails that your Draw Tite 15k fifth wheel hitch needs so it would work well for you. This is compatible with Demco Hijacker Premier Series, B&W, Curt, Draw-Tite, Hidden Hitch, Husky, Reese, and Valley above-bed 5th-wheel trailer hitches as it is designed to match the industry standard fifth wheel rail dimensions.
    view full answer...
    Image 1 for
  • Does Demco Fifth Wheel Rail Kit Adapter # DM6140 Fit B and W Turnoverball Hitch
    The Demco adapter part # DM6140 that you referenced is a confirmed fit for the B and W Turnoverball gooseneck hitch you have installed in your 2017 Ford F-250. This will allow you to install an industry standard fifth wheel hitch by B&W, Curt, Draw-Tite, Hidden Hitch, Husky, Reese, and Valley.
    view full answer...
  • Does The Demco Adapter Rails For B&W Turnover Ball Fit Tight To The Bed?
    Yes, the Demco 5th Wheel Base Rails Adapter # DM6140 will sit firmly on top of the bed. The adjustment bolt tightens the adapter down on the hitch pin for the B&W Turnover ball placing it firmly against the top of the bed.
    view full answer...
  • Adjustability of DEMCO 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitch
    The Curt X5 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Trailer Hitches - 20,000 lbs item # 16310 you referenced has been known to have issues with bed liners and not being able to fully sit in the B&W Turnoverball Underbed Gooseneck Trailer Hitch w/ Custom Installation Kit - 30,000 lbs item # BWGNRK1116. There is a lot of resistance to people not wanting to cut large sections of their bedliners out to make these two pieces compatible. The Demco 5th Wheel Base Rails Adapter...
    view full answer...
    Image 1 for
  • Comparing the B&W and Curt Underbed Systems for a 2022 GMC Sierra 2500
    I would be happy to compare the B&W Turnoverball System item # BWGNRK1020-5W to the Curt Underbed System item # C60642. Both of these systems are confirmed to fit the 6-3/4' and 8' bed lengths of the 2022 GMC Sierra 2500. The main advantage of the B&W over the Curt is that B&W has 5th wheel hitches made specifically for their turnover ball system. These hitches are some of the best 5th wheel hitches on the market. If you have a short bed and need a slider item # BWRVK3400-5W or the standard...
    view full answer...
    Image 1 for Image 2 for
  • Does Demco 5th Wheel Base Rails Adapter # DM6140 Fit B and W Gooseneck Hitch
    Sounds like you may not have a B and W gooseneck hitch since that brand uses square holes. Could you possibly check under the truck bed to see if you can see a brand? With more info I could see if we have a suitable adapter.
    view full answer...
    Image 1 for
  • 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...
  • Adapter to Fit RBW Lil Rocker In Truck Bed with B and W Turnoverball Gooseneck Hitch
    If you are absolutely sure the gooseneck hitch in your trailer is a B and W Turnover ball # BWGNRK1057 then the Demco Rail Adapter part # DM6140 will work as an adapter. It fits the B and W hitch and provides a set of fifth wheel rails that the RBW Lil Rocker is designed to fit so you'd be good. We know that the RBW LR-1000 is a version of the Lil Rocker that fits this rail design.
    view full answer...
    Image 1 for Image 2 for
  • Does Demco Fifth Wheel Base Rail to B&W Gooseneck Hitch Adapter DM6140 Work with Curt Hitch
    Yes, the Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches # DM6140 that you referenced will work well with your Curt R20 slider base.
    view full answer...
    Image 1 for
  • Fifth Wheel Hitch Solution for 2016 Chevy Silverado 2500 with B and W Gooseneck Installed
    The auto sliding style of fifth wheel hitches can't be used with the B and W Turnoverball hitches as they require the hitch connect in four locations on the outsides of the hitch whereas the Turnoverball solutions only attach with a center post and the torque is too much for the hitch. This is true even with an adapter like the part # DM6140 that you referenced. The simplest solution is to go with a B and W Companion Slider like part # BWRVK3400 which will fit your current gooseneck hitch...
    view full answer...
  • Is the Demco Base Rail Adapter # DM6140 Adjustable Vertically for Truck Bed Liners
    The shaft portion of the Demco 5th Wheel Base Rails Adapter # DM6140 that you referenced is vertically adjustable so that you can match the height of the bed perfectly. This is helpful when the truck has a bed liner and the bed floor is slightly raised because of it. I attached a picture that shows how the adjustment is made.
    view full answer...
    Image 1 for
  • Will Demco 5th Wheel Base Rail Adapter part # DM6140 Fit Turnoverball Rail Kit of 2019 Ford F-250
    Yes, since your 2019 Ford F-250 has a B and W Turnoverball gooseneck hitch # BWGNRK1116 the Demco 5th Wheel Base Rail Adapter part # DM6140 would work to provide you with a set of standard fifth wheel rails.
    view full answer...
  • Sliding 5th Wheel Hitch Options for B&W Turnoverball Gooseneck Hitch
    A sliding hitch is necessary for a short bed truck if you don't have a Sidewinder style rotating pin box to give you the turning clearance you need so your trailer doesn't make contact with the cab of your truck. Although the B&W Companion Slider # BWRVK3400-5W is the one of the best options for a slider, you are correct that you do have other options. The biggest issue is that you can't have 5th wheel rails and your gooseneck installed at the same time due to the mounting locations,...
    view full answer...
  • Best 5th Wheel Hitch to Use for a 2013 Silverado 2500 with a 6-1/2 Bed and B&W Gooseneck Hitch
    I do have a solution for you, but unfortunately you cannot use a Sidewinder or the Demco Adapter # DM6140 and sliding 5th wheel hitch with the B&W Gooseneck hitch installed on your 2013 Chevrolet Silverado 2500HD. The reason being that there will be too much torque that rests on the one connection with the gooseneck hitch. You could use the Demco Adapter # DM6140 with your Reese 20K # RP30928 or a manual sliding 5th wheel hitch like the Reese 16K # RP30051, but you cannot use it with an...
    view full answer...
    Image 1 for Image 2 for
  • Will Curt CrossWing 5th Wheel Hitch Fit with B&W Gooseneck Hitch on 2021 Ram 2500
    The Curt CrossWing Lightweight 5th Wheel Trailer Hitch # C86JR will fit with the B&W Turnoverball Underbed Gooseneck Trailer Hitch # BWGNRK1320 on your short bed 2021 Ram 2500 but you'll need to use the Demco 5th Wheel Base Rails Adapter # DM6140 since the CrossWing connects to the truck via base rails as opposed to the gooseneck hitch ball. As far as safety chains go, 5th wheel towing actually doesn't require the use of safety chains so that's one less thing you'll need to mess with. I...
    view full answer...
  • Can Above Bed Rails Be Used With B&W Turnoverball Underbed Gooseneck Hitch Installed
    If you already have a B&W Turnoverball Underbed Gooseneck Trailer Hitch then all you need to install standard base rails is an adapter, the Demco 5th Wheel Base Rails Adapter part # DM6140 or the Curt X5 5th Wheel Base Rails Adapter part # 16310. These adapters drop into the gooseneck hitch opening and provide a set of industry standard above bed base rails that will work with pretty much any fifth wheel hitch for the exception of auto-sliding fifth wheel hitches which create too much stress...
    view full answer...


< Previous
123. . .6



Do you have a question about this 5th Wheel Gooseneck Adapter?


Info for this part was:

Employee Jackie C
Expert Research:
Jackie C
Employee Mike L
Expert Research:
Mike L
Employee Michael H
Expert Research:
Michael H
Employee Jameson C
Expert Research:
Jameson C
Employee Adam R
Expert Research:
Adam R
Employee Lindsey S
Edited by:
Lindsey S
Employee Jeff D
Installed by:
Jeff D
Employee Conner L
Installed by:
Conner L
Employee Joshua S
Video Edited:
Joshua S
Employee Wilson B
Updated by:
Wilson B
Employee Hannah L
Updated by:
Hannah L
Employee Kristina F
Updated by:
Kristina F
Employee Noah M
Updated by:
Noah M
Employee Amanda M
Written by:
Amanda M
Employee Jonathan Y
Video by:
Jonathan Y

At etrailer.com we provide the best information available about the products we sell. We take the quality of our information seriously so that you can get the right part the first time. Let us know if anything is missing or if you have any questions.


Product Experts Available Now!
Call 1-800-940-8924