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Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches
(85 reviews)
Price: $689.00
In Stock
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Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches
Part Number: DM6140
In Stock
$689.00
Retail:$814.00
You Save: $125.00
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- All Info
- Reviews (85)
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Demco 5th Wheel Gooseneck Adapter - DM6140
Highlights
- Use Your Turnoverball for Fifth Wheels: Drops into the gooseneck ball hole to add above-bed rails for standard fifth-wheel hitches.
- Tow Heavy Loads Confidently: Rated at 21,000 lbs GTW and 5,250 lbs vertical load for secure towing of large trailers.
- Works with Industry-Standard Hitches: Fits Demco Hijacker Premier Series, B&W, Curt, Draw-Tite, Hidden Hitch, Husky, Reese and Valley fifth-wheel hitches.
- Quick, Drop-In Install: Simply lower into the gooseneck opening, lock in place, and tighten the adjustment bolt for a solid bed fit.
- Set the Height You Need: Adjustable mount compensates for bed mats or liners for a flush, level connection.
- Durable Powder-Coated Steel: Black finish resists corrosion and stands up to repeated hitch changes.
Features to know about
Switch from Gooseneck to Fifth Wheel Fast: Adapter Drops Right In
If your setup already has a B&W Turnoverball gooseneck hitch but you want to tow a fifth wheel, this adapter makes it simple. Just drop it into the gooseneck ball hole, lock it in place, and you’ve got a set of above-bed industry standard rails ready for your fifth wheel hitch. It works with hitches from Demco Hijacker Premier Series, B&W, Curt, Draw-Tite, Hidden Hitch, Husky, Reese, and Valley. The fit is solid and positive—tight enough that it feels like part of the truck once it’s secured.
Handles Heavy Loads with Confidence: Rated for 21,000 lbs GTW
This adapter is built for serious towing. It’s rated for a gross towing weight of "21,000 lbs" and a vertical load limit of "5,250 lbs". That means when you’re hitched up to a heavy trailer, the adapter delivers dependable strength without flex or slop. The black powder coated steel construction adds long-term durability and corrosion resistance so you can count on it season after season.
Keeps Your Bed Practical: Converts Without Permanent Hardware
You don’t have to sacrifice your bed space for a permanent fifth wheel install. Since this adapter connects right through the gooseneck opening, it can be removed whenever you want your bed cleared for other work or gear. When you’re ready to tow again, just drop it back in and lock it down—it’s that quick.
Adjusts for Bed Mats and Liners: Height Tuning Built In
If you’ve got a bed mat or spray-in liner that changes the surface height, the adjustable mount makes sure the base plate sits flush every time. The bolt draws the adapter tight against the bed floor so there’s no rocking or movement once it’s in place. That adjustability keeps your fifth wheel rails level and your connection steady.
Built Strong and Simple: Straightforward Design, No Guesswork
With no drilling required and all mounting done through the existing gooseneck socket, installation is quick and clear. The sturdy steel frame and black powder coat finish resist rust and wear from regular use. It’s a straightforward setup that lets you switch between towing styles easily while maintaining that solid hookup you want when towing heavy equipment or RVs.
Specs
Weight and Capacity
- Gross towing weight: 21,000 lbs
- Vertical load limit: 5,250 lbs
Note
- 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.
- Does not work with B & W BWGNRK1257 Turnoverball for 2007 to 2021 Toyota Tundra's.
6140 Demco Base Rails w/ B&W Ball Adapter for 5th Wheel Trailer Hitches
Customer Satisfaction Score:
93% were satisfied with this product
7% of customers were not satisfied
- etrailer mistake
- Wrong item was ordered
- Too difficult to install
Ratings & Reviews
4.7
85 reviews
by:
Tim
10/12/2024
Products fit properly, I haven’t used it yet with my 5th wheel hitch but appears to be sturdy and should work well. Easy to switch form 5th wheel hitch to gooseneck ball.
by:
Cliff A
05/16/2020
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:
Shawn
06/23/2023
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:
Charles Dean
07/15/2024
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:
Jasen
04/07/2024
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.
Jasen
4/8/2025
I still love the product I’ve had no issues with it at all. I bought an engine hoist to lift my fifth wheel hitch in and out of the bed and I just leave this gooseneck adapter plate in place because of it’s low profile I can still use the bed. It makes it so much more easy to install and remove the fifth wheel hitch, and with the engine hoist I’m constantly moving that heavy sucker in and out.
Jesse M.
4/8/2025
@Jasen Nice! Thanks for sharing. I have heard of people using engine/game hoists for lifting those heavy 5th wheel hitches. It definitely makes an otherwise impossible task a lot easier!
Feel free to come back anytime you need anything.
by:
Terry
04/01/2026
Packaging was severely damaged upon arrival,
by:
Tim
09/14/2020
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:
Rick
02/28/2025
It's so easy to find, research and purchase through etrailer and they are good knowledgeable fells. I would have given five stars if it were not for the weak packaging. Box was very thin cardboard that was completely falling apart when it arrived. Other than that, Thanks Guys :)
Victoria H.
2/28/2025
Thanks for the feedback, Rick! We will be here and happy to help whenever you're ready for your next project!
by:
Jeff B
12/21/2016
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:
Ryan
07/19/2019
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:
William
02/19/2019
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:
Brent
07/23/2018
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:
Bob
07/29/2021
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:
Stefan t
10/18/2017
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:
Melvin P
03/18/2017
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:
James
03/30/2021
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.
Very well packed with all necessary parts securely attached to item.
by:
Brock P
05/20/2019
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:
Lance
05/16/2020
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:
Tony
02/23/2019
It works perfectly with my B&W turnover hitch and Reese 20k 5th wheel hitch.
by:
Noel
10/07/2018
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.
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:
Kevin P
10/03/2019
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
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:
Michael
12/14/2020
Product had minimal set up, and works perfectly. As for etrailer staff, they are consistently great.
Patrick
1/25/2022
Sorry for delay in answering, my wife and I are very happy with product.
by:
James
02/06/2024
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:
Ivan
09/20/2018
Fast shipping! Adapter plate fit perfect. Installation was easy. Customer service rep was awesome on giving me information on correct adapter plate for my truck. Thank you Etrailers! I will do business again with you for all my trailer needs.
by:
Jack P
01/02/2020
Gooseneck adapter has worked out fine. I pull a 20,000 pound trailer no problem.
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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...
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- 5th Wheel Hitch Will Not Line Up With Adapter for B&W GooseneckI do have an option for you but I am not sure that you have a B&W 5th Wheel Hitch as they only offer one mounting option for industry standard rails, the B&W Patriot which is not that old and this would have no problem installing onto either the Curt X5 5th Wheel Base Rails Adapter part # 16310 or the Demco 5th Wheel Base Rails Adapter for B&W Turnoverball Gooseneck Hitches part # DM6140 if done so correctly. I think the hitch you have does not use industry standard mounting holes if...
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view full answer... - Is Demco 5th Wheel Adapter # DM6140 Compatible with Draw Tite Fifth Wheel HitchThe 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.
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- Can Truck with Tall Tool Box Above Truck Bed Rails Tow 5th WheelWith that tall of a tool box you'd need to remove it before you could tow a fifth wheel trailer. You need at least 6 inches between the top of the bed rails and the fifth wheel overhang to prevent any type of interference and having a 6.5 inch tall box above the bed rails would mean you'd need at least 12.5 inches total which would be pretty difficult. Added reason it gets difficult is that the trailer then has to sit perfectly level as well. The Demco # DM6140 does fit your B and W Turnoverball...
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Tim
10/13/2025
This is a great product so easy to use with my slider hitch no sloppiness whatsoever and easy to swap out to gooseneck ball