Flatbed Kit: 2003-2025 Dodge 3500 Longbed Dually

$899.00

FREE SHIPPING in lower 48 states!

Required to complete the 2003-2025 Dodge 3500/4500 Dually long bed flatbed. Overall bed dimensions are 8 ft wide at the back, 7 ft wide at the front, and 107″ long.

What the kit includes:

  1. Blueprint with material list, cut instructions, and build diagrams for a 2003-2021 Dodge 3500/4500 Dually long bed. See below to preview the blueprints. Blueprints will be downloadable upon purchase. Scroll down for a video explanation.
  2. All laser cut parts. (3 tail pieces, 6 tail gussets, two headache rack gussets, a fuel plate and bezel, and two light brackets.) Tail pieces and gussets made from 3/16″ thick steel. Light brackets and fuel plate/bezel made from 1/8″ thick steel. All parts are un-coated (raw steel). Parts will be delivered 3-7 business days after ordering – free shipping in the lower 48. Scroll down for a video explanation.
  3. Full access to the start to finish video tutorial on how to build, wire, and install your bed. Scroll down to watch the video tutorial.

What the kit DOES NOT include:

This kit does not include all parts needed to complete your flatbed – you will have to purchase all of the generic steel at a local steel dealer. The amount and type of steel you need to purchase is laid out clearly in your model specific blueprint. The physical parts we ship are simply the laser cut parts you cannot buy locally. You can download the material list of the steel you’ll have to source here.

How our flatbed kits work in 2 minutes

Download the Flatbed Material List

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Customer Reviews

Trever
Trever
California
Read More
The deck turned out great. The step-by-step videos were amazing and easy to follow. Having the full build plans saved a lot of time not having to do all the measurements and figuring out the whole deck myself. This saved me a lot of money by building it myself. Great end product and great project for the do-it-yourself person.
Kaden S.
Kaden S.
Holliday, TX
Read More
If you’re looking to build a flatbed this is the way to go! This is an awesome company, sells a great product. Great customer service! Blueprints are clear and simple and the additional video tutorials help out. I had no issues getting this thing put together and ready for an Ag. Mech. Show. Looks slick and let me tell you this heavy duty bed could take a hit if needed. Highly recommend!
Darren
Darren
Las Vegas, NV
Read More
I was looking for a budget priced flatbed for a low budget build. I came across Double Diamond Fabrication, and for me, it looked like a good fit for my project. I didn’t want a steel deck, as summers in Las Vegas are way too hot for them, so wood was a priority. I’ve been welding for over 25 years, mostly just repair work, and would have never had the insight to build a bed this nice myself. I called with some questions, and they got back to me quickly and answered them all with confidence in their product, so I put in my order. It shipped and arrived quickly. Once the build started, it went smoothly, as before each step you watch the corresponding video for what you’re about to do. The techniques used are very sound, such as making jigs for repetitive work, and welding procedures to pevent warping and/or skewing the frame. I ended up picking up a couple tricks I will be using in the future as a bonus. Overall, I’m very glad I chose this route for my build. Everyone who’s seen it really likes it. Price wise, I am very satisfied, too, it stayed well within my budget. Thanks again, DDFab!
Michael C.
Michael C.
Anchorage, AK
Read More
Well I must say I am very pleased with Double Diamonds Fabrication's Flatbed Kit for my 2008 F250 SD Long Bed. The blueprints provided were a perfect fit to my truck, the video tutorials are also a nice addition and found to be helpful. This build was fun and prompted me to repaint my truck as well to match the new bed. I would recommend this to all DYI'ers or professional fabricators. Having access to a shop with a forklift definitely helped. I followed the blueprints mostly but added some of my own creative tweaks and love how it turned out. Hat tip to DDFab!
Paul K.
Paul K.
Dayton, OH
Read More
A great value for a flatbed, and very well designed. These guys will walk you through any problems you have when building, and you get a great flatbed at half the cost of a commercial one. I am very proud to say I built this, and I couldn't have done it on my own. I highly recommend even if you are an amateur welder like myself that you give this a try.
Jaxon S.
Jaxon S.
Utah
Read More
I give DDF 5 stars. These guys were amazing to buy products from. Easy to talk to, helpful service and very clear instructions. If you can read a tape and are a decent fabricator this is the place for you. Personally I’m letting my bed get some surface rust then I’m going to clear coat it, I love the way it looks. These guys are awesome, well worth my time!!
Jackson G.
Jackson G.
Indiana
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I wanted a durable and functional truck bed that would stand up to use for years to come, after the original truck bed was rusted out, and had a tree fall on it, I decided building my own flatbed was the option that made the most sense, I wanted to have the pride of building my own, and save some money in the process, and this kit did an amazing job at that! I would recommend this kit to anyone looking for a durable, and good looking flatbed!
David L.
David L.
California
Read More
Now that I'm all wrapped up with this project, I can relax a write up my own two cents worth of a review. I could not have had a better online interactive experience than this flatbed project with DD. The pricing was fair for what was actually physically provided by DD, but the real value was the easily acquired tutorials on how to build this thing. Give that guy a raise. Step by step, clear instruction on the build took the anxiety completely out of this build.  This project was epic. Had I only kept things on the simpler side, I suppose it would not have taken as long. But because I wanted to make it my own, I added a lot of time and work to it. In the end, I am very pleased with the outcome and satisfied knowing I made the right choice by choosing to go with the Double D product.
Allen G.
Allen G.
Redmond, OR
Read More
This kit is great. Blueprints were easy to follow. The tutorial videos are good, the tips and tricks in them helped a bunch. It's a nice design that also gave me the freedom to modify the bed to fit my needs. The guys down at Double Diamond were awesome too. Very helpful and were very prompt in answering questions in text and email.
Kyle L.
Kyle L.
Marble Falls, TX
Read More
The fact they give you the ability to source your own material gives me peace of mind. The detailed videos that they provide give you the steps required to complete your bed! Even when I was building the bed lots of people were curious as to where I got the blueprints, because it fits with the truck. The ability to buy the lights and wiring for the truck is so much easier to install. I was very impressed with the structure and definitely suggest this to others as well!
Travis M.
Travis M.
Emmett, ID
Read More
The whole process from ordering to installation was super easy. The website is easy to navigate for ordering, the “how to videos are a great tool, blueprints and cut list easy to follow. Great product!
Jesse R.
Jesse R.
Deer Lodge, MT
Read More
This was by far the best thing I have done in a very long time! I loved how nicely precise the measurements were and how quickly it went together. Most places here in Montana cost $7,000 or more for a new flat bed. This kit was greatly priced and very nice to look at. I am very pleased!!!
Zach T.
Zach T.
Michigan
Read More
Amazing company! very easy to follow blueprints and video tutorials. this is the first thing I have ever built from raw material to finished product, and am pleased with the way it turned out. If you can read a tape measure and weld you can build it.
Pat
Pat
Pennsylvania
Read More
Most of my welding has been repairing broken trucks or mangled equipment. I have a hard time paying folks to do stuff I can do myself, so the DD fab kit appealed to me. I have no fancy tools. Mig, 4 inch grinder, several squares, some c clamps. I ground everything out with cut off wheels in the grinder. I watched the videos then went to the shop to use what I had learned. The headache rack and it's angles worried me, but when I got it ready to weld, I looked at it and thought....this is genius these DD guys know their stuff. I needed some advice and they fixed me right up, so the support is there if needed. Bed came out real nice. Thanks!
Raymond
Raymond
Burns, OR
Read More
Excellent product and very affordable. The company was always easy to get in touch with when needed. I do wish the blueprints were more detailed for people like us working in a shop with no cell service. A few pointers for anyone looking into buying one: make sure you have a bandsaw, someone to help you is a good idea, experience with fabrication isn't needed but definitely helpful. Overall we are so impressed and with be making another purchase in the future. 
Scott
Scott
Canada
Read More
The deck turned out great. The step-by-step videos were amazing and easy to follow. Having the full build plans saved a lot of time not having to do all the measurements and figuring out the whole deck myself. This saved me a lot of money by building it myself. Great end product and great project for the do-it-yourself person.
Trever
Trever
California
Read More
The deck turned out great. The step-by-step videos were amazing and easy to follow. Having the full build plans saved a lot of time not having to do all the measurements and figuring out the whole deck myself. This saved me a lot of money by building it myself. Great end product and great project for the do-it-yourself person.
Kaden S.
Kaden S.
Holliday, TX
Read More
If you’re looking to build a flatbed this is the way to go! This is an awesome company, sells a great product. Great customer service! Blueprints are clear and simple and the additional video tutorials help out. I had no issues getting this thing put together and ready for an Ag. Mech. Show. Looks slick and let me tell you this heavy duty bed could take a hit if needed. Highly recommend!
Darren
Darren
Las Vegas, NV
Read More
I was looking for a budget priced flatbed for a low budget build. I came across Double Diamond Fabrication, and for me, it looked like a good fit for my project. I didn’t want a steel deck, as summers in Las Vegas are way too hot for them, so wood was a priority. I’ve been welding for over 25 years, mostly just repair work, and would have never had the insight to build a bed this nice myself. I called with some questions, and they got back to me quickly and answered them all with confidence in their product, so I put in my order. It shipped and arrived quickly. Once the build started, it went smoothly, as before each step you watch the corresponding video for what you’re about to do. The techniques used are very sound, such as making jigs for repetitive work, and welding procedures to pevent warping and/or skewing the frame. I ended up picking up a couple tricks I will be using in the future as a bonus. Overall, I’m very glad I chose this route for my build. Everyone who’s seen it really likes it. Price wise, I am very satisfied, too, it stayed well within my budget. Thanks again, DDFab!
Michael C.
Michael C.
Anchorage, AK
Read More
Well I must say I am very pleased with Double Diamonds Fabrication's Flatbed Kit for my 2008 F250 SD Long Bed. The blueprints provided were a perfect fit to my truck, the video tutorials are also a nice addition and found to be helpful. This build was fun and prompted me to repaint my truck as well to match the new bed. I would recommend this to all DYI'ers or professional fabricators. Having access to a shop with a forklift definitely helped. I followed the blueprints mostly but added some of my own creative tweaks and love how it turned out. Hat tip to DDFab!
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How do our Products Work?

Our 3-Part Kits make your job easy. Check out the videos below for everything you need to know.

1. Video Tutorial

With 28 modules and over 5 hours in length, no detail is left out covering how to build, wire, and install your flatbed.

2. Model Specific Blueprints

Watch the following video for an explanation .

3. Machine Made Parts Shipped to You.

Watch the following video for an explanation .

Choose between a wood, steel, or trex deck.

Buy the same kit, and the video tutorial and blueprints will give you instructions on your choice of deck material. 

2003-2024 Dodge Gallery

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Flatbed Kit General FAQs

Standard Bed Cost List

Flatbed Kit -$799 (SRW), $929 (DRW) (Free Shipping)

Generic Steel you will need purchase from a local steel dealer* – ~$700-$1500 Download the Steel List.

Lights/Wiring/Decking – ~$600

Finish (Powdercoat/Paint)* – $35 – $1000

Total Cost of build: $2000- $3500

*Prices are subject to local supplier and serve as an estimate only.

Optional Add-Ons

Underbody Tool Boxes: ~$500-$600

Fender Kit: $209-$299

Our Kits are unconventional in that we don’t send you everything, only the machine made parts that you can’t purchase locally. Why? Because it would be what’s known as a rip-off to charge you for mark up and exorbitant amounts of shipping cost to sell you generic steel that you can buy locally without a middle man. That being said, you’ll be responsible in purchasing the generic steel to make the process as affordable as possible. Download the free material list so you can get an exact cost for everything you’ll need. We’ll still send you the machine made parts and provide you with the blueprints to make the build seamless.

This kit gives you everything you need to seamlessly complete the base model bed. It is designed to be a cheap alternative to pre-made flatbeds.

Our kit comes with 3 components:

  1. Model Specific Blueprint – this will be emailed to you upon purchase. This is an easy to understand document that has the material list, cut sheets, and build diagrams specific to your model. 
  2. Machine Made Parts shipped to you – we send you all the laser cut parts (tail assembly, fuel plates, etc.). It is your responsibility to source all the generic steel listed in the blueprints, you can also download the list of the steel you’ll need here. These parts ship free in the lower 48 states. 
  3. Start to Finish Video Tutorial – this completely exhaustive step by step video tutorial is over 5 hours long, and gives a step by step guide to build, wire, and install your flatbed. 

Experince Needed

Moderate to advanced welding experience is needed to complete this project as well as experience using all shop tools described below.

Tools and Equipment Needed

  1. Ear Plugs
  2. Safety Glasses
  3. Welding Helmet
  4. Welding Gloves
  5. Welding Coat or protective outer layer
  6. Welder – needs to adequately weld 3/16” thick plate
  7. Bandsaw/chop saw/cold saw – capable of handling 2.5” square tube and cutting angles.
  8. Angle Grinder
  9. Tape Measure
  10. Vice grips OR C-clamps – 6 total
  11. Square
  12. Drill Press OR Hand Drill
  13. (2) 7/32” Drill Bit
  14. ¾” Drill bit (only if installing marker lights)
  15. 1″ drill bit or hole saw
  16. Type 27 Flapper disk grinding wheel(s)
  17. Slitter disk(s) OR Plasma Cutter
  18. Metal Pencil or Sharpie Marker
  19. Forklift OR Shop Crane OR 4 Strong people (for installation)

An experienced fabricator can build this project in 30 hours and install in 8 – 10 hours.

Gooseneck Ball

Our Kits are designed to fit with your existing frame mounted gooseneck ball. If you don’t currently have one installed, you will need to add a frame mounted gooseneck ball. 

Bumper Pull Hitch

Our kits fit seamlessly with your factory bumper pull hitch. Why? Because it’s far superior to have your hitch tied directly to your frame and the engineered from the the factory setup.

We only offer .dxf cut files in our dealer program, for businesses interested in building and selling our fully built flatbed designs in their area. Learn More >

Flatbed Design FAQs

Gooseneck Ball

Our Kits are designed to fit with your existing pickup frame mounted gooseneck ball. This includes turnover balls such as B+W and others. Our bed will simply install over the top of your gooseneck ball and be accessed by a hole in the top deck.  If you don’t currently have one installed, you will need to add a frame mounted gooseneck ball. NEVER weld hitches of any kind into the bed, always install directly to your pickup frame. 

Bumper Pull Hitch

Our kits fit seamlessly with your factory bumper pull hitch. Why? Because it’s far superior to have your hitch tied directly to your frame and the engineered from the the factory setup. If you have a cab and chassis, order a factory designed bolt on bumper pull hitch prior to installing the bed.

SRW beds: 7 ft wide.

Dually Beds: 8 ft wide at back, 7 ft wide at front.

1st Gen Tacoma Beds: 6 ft wide

2nd/3rd Gen Tacoma Beds: 6″ 8″ wide

If you want more detailed dimensions including length, you’ll have to first purchase a flatbed kit. 

Wood/Trex deck Design:

  • Full size longbed base model: 805 lbs (longbed) 750 lbs (shortbed) If you have a dually add 60 lbs. Add-ons will add incremental weight increases.
  • Tacoma Models: 475 lbs

Steel Decks:

  • Full size longbed base model: 900 lbs (longbed) 825 lbs (shortbed) If you have a dually add 80 lbs. Add-ons will add incremental weight increases.
  • Tacoma Models: 525 lbs

Weight Difference from Stock Beds: For full size beds generally you will only be net ahead about 325 lbs. from your stock bed weight for wood/trex decks, and 400 lbs. heavier for steel deck models. For Tacoma models, it will be about 200 lbs. more for a wood deck, and 250 lbs. more for a steel deck than your stock bed weight. 

Our flatbeds are designed to be extremely durable and withstand the hardest use. A safe payload is around 4000 lbs, but in most cases the suspension on your pickup will fail before the bed becomes overloaded. Due to construction being primarily from tubing rather than formed sheet metal, our beds are significantly more durable than most factory built beds. 

Our bed rails are not something you can purchase from us in kit format; they are something we instruct you to build if you want to add them. There is a module of the video tutorial that provides step by step instructions to build the bed rails as well as the additional material you’ll need to purchase. Since the bed rails are built entirely from generic steel, you can make them any height you’d like and choose between the drop in or fold down design. (you must purchase a flatbed kit to access the video tutorial). 

Shipping and Returns

Free shipping in the lower 48 states!

AK and HI – $150 flat rate (make sure and order the kit and all add-ons in one shipment and you’ll only be charged and extra $150 for everything.

Canada – $150 USD Flat rate. You will be responsible for any taxes/duties/or extra shipping charges incurred upon delivery.

We almost always send order 1-3 business days after they are ordered, and then there will usually be a 2-5 business day transit time. You will receive and shipment notification and tracking number to your email when your package ships. If we are behind for any reason, we are good about letting customers know about the status of their order.

You can return new, unused parts as long as the package is shipped back to us within 30 days of the order date.  You will, however, be responsible for return shipping costs and will be charged a 25% restocking fee.

Your refund will be issued upon the parts being returned in good condition. Used or badly damaged parts will not be issued a refund for the order or return shipping costs.

How to request a return: Send us an email (support@ddfab.co) with your name and order number and we will confirm that you are eligible for a refund and give you return instructions. 

You can cancel your order if the order has not yet been packaged for shipment. You will be charged a 10% transaction fee of your order total that will be deducted from your refund. 

Orders cannot be cancelled after they are packaged for shipment. You can return the order, but will be charged a 25% restocking fee and return shipping costs. 

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