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Reese Quick-Install Custom Installation Kit w/ Base Rails for 5th Wheel Trailer Hitches

Reese Quick-Install Custom Installation Kit w/ Base Rails for 5th Wheel Trailer Hitches

Item # RP50085-58
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Fifth Wheel Installation Kit

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Custom brackets reduce the amount of drilling and time required to install your fifth-wheel trailer hitch. Brackets, base rails, and hardware included. Call 800-298-1624 to order Reese fifth wheel installation kit part number RP50085-58 or order online at etrailer.com. Free expert support on all Reese products. Guaranteed Lowest Price and Fastest Shipping for Reese Quick-Install Custom Installation Kit w/ Base Rails for 5th Wheel Trailer Hitches. Fifth Wheel Installation Kit reviews from real customers.
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  • Reviews (5)
  • Q & A (41)
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  • Why etrailer?

2016 Ram 3500 - Reese Quick-Install Custom Installation Kit w/ Base Rails for 5th Wheel Trailer Hitches

  • Above the Bed
  • Reese
  • Custom

Custom brackets reduce the amount of drilling and time required to install your fifth-wheel trailer hitch. Brackets, base rails, and hardware included.


  • Custom brackets mount beneath your truck bed to provide attachment points for 5th-wheel rails
  • Base rails sit in truck bed and allow installation of 5th-wheel trailer hitch
  • Vehicle-specific brackets mount to existing holes in your vehicle's frame
    • Minimizes drilling and measuring
    • Cuts installation time in half when compared with universal bracket systems
  • Kit includes custom brackets, rails, and hardware
  • Compatible hitches: Curt, Draw-Tite, Hidden Hitch, Reese, Valley, and Husky
    • Will not fit Reese Elite Series (Signature Series) or Valley UBS hitches
  • Black powder coat finish resists corrosion
  • 10-Year limited warranty

50085 Reese Custom Quick Installation Brackets

58058 Reese Fifth Wheel Rails - 10 Bolt Design

Installation Details RP50085-58 Installation instructions

Customer Reviews

Reese Quick-Install Custom Installation Kit w/ Base Rails for 5th Wheel Trailer Hitches - RP50085-58

Average Customer Rating:  4.0 out of 5 stars   (5 Customer Reviews)

Custom brackets reduce the amount of drilling and time required to install your fifth-wheel trailer hitch. Brackets, base rails, and hardware included.

- RP50085-58

Very poor design for the Ram 3500. The front brackets have four holes to secure the rail. Two are used and the other two bolts use spacers and the bed to secure the rail. Should be designed to use all of the bracket for a stronger hold on the hitch.

- RP50085-58
2018 Ram 3500

I've bought 2 Reese Quick Install kits this year, the sales reps at etrailer were very helpful.Shipping times great. Did have wrong bracket in one order, was taken care of promptly.

- RP50085-58

Excellent, well built, well designed kit. Install went without any issues.

- RP50085-58

Front brackets do not have a specific spot they can be installed, So it just makes it harder to line up properly before drilling into your bed

- RP50085-58


Ask the Experts about this Reese Fifth Wheel Installation Kit

  • Under Bed Brackets Only for Reese 10-Bolt Rails and a 2016 Ram 3500 Short Bed
    For your 2016 Ram 3500 short bed and Reese rails you can use custom brackets # RP50085. These are the brackets by themselves without the rails. It comes with the necessary hardware to attach the brackets to the frame and the rails to the brackets.
    view full answer...
  • 5th Wheel Rail Kit Confirmed To Fit 2017 Ram 3500 6 Foot Bed Without Factory Rail Kit
    For your 2017 RAM 3500 6 foot bed, the rail kit # RP50085-58 is a confirmed fit. If you want the easier to install outboard kit, the # RP56010-53 is also a confirmed fit. The benefit of the longer rail of 48 inches versus the 43 inch rail is ease of install, but length of rail could be a drawback depending on your perspective.
    view full answer...
  • Fifth Wheel Rail Kit Recommendation for 2018 Ram 3500 Short Bed
    Reese has three rail kits available for your 2018 Ram 3500 short bed with the Ramboxes. The one I recommend is the part # RP50085-58 as it is a custom install kit that will give you the smaller dimension rails. The part # RP56010-53 is a kit that has brackets that install on the outsides of the truck frame which makes it a bit easier to install but the rails are bigger. The part # RP30035-520 is a semi custom kit that will be much more involved to install. Since you have a Rambox...
    view full answer...
  • Is Valley Powerpull 5th Wheel Hitch Compatible with Reese Industry Standard Truck Bed Mounting Rails
    The Reese # RP50085-58 bracket/rail kit is compatible with your truck. If memory serves correctly, the Valley PowerPull was compatible with the industry standard bed rails that Reese (and other companies) uses. You can confirm this for yourself by measuring the spacing of your hitch mounting tabs that insert into the rails front to back and side to side, center on center. Compare the results with the photo I've edited for you. The tabs, when measured front to back should be about 22...
    view full answer...
    Image 1 for
  • Comparing Reese Quick-Install Custom Installation Kits for a 2020 Ram 3500
    The Reese Quick-Install Custom Installation Kit part # RP50085-58 and part # RP56010-53 are both correct for a 2020 Ram 3500. The difference is that the latter comes with outboard base rails and the former comes with inboard base rails. The outboard base rails are easier to install since they attach outside the frame whereas the inboard base rails are harder to install since they attach inside the frame but that's it.
    view full answer...
  • How to Tow a 5th Wheel Trailer with a 2018 Ram 3500 Short Bed Rambox
    As long as you are using a Sidewinder pin box, you should not have any problems with a 5th wheel trailer on your 2018 Ram 3500 with Rambox. The Rambox limits the side to side clearance in your truck bed which is problematic for fixed pin boxes as they will likely contact the inside of the bed. Using a Sidewinder will move the pivot point away from the bed sides and will allow for greater turning clearance and minimized interference. Unfortunately, an under bed mounting kit is not compatible...
    view full answer...
  • Recommended 5th Wheel Install Kit for a 2014 Dodge Ram 3500 with 6-1/2 Foot Bed
    In order to install a Reese 5th wheel hitch in the bed of your 2014 Dodge Ram 3500, I recommend using the either the Reese Quick-Install Custom Inboard Installation Kit part # RP50085-58 or the Reese Quick-Install Custom Outboard Installation Kit part # RP56010-53. The only difference between the two is where the connection points are for the frame brackets and base rails. On the inboard kit the connection point for the frame brackets and base rails are located inside the frame rail...
    view full answer...
  • Fifth Wheel Rail Kit Recommendation for 2015 Dodge Ram 3500 for Draw Tite Slider Hitch
    For your 2015 Ram 3500 we have rail kits that will work with your Draw Tite slider hitch. Best option would be a custom install kit that will install much quicker than a universal style kit and will minimize drilling. For that you'd want the # RP50085-58 which is a confirmed fit.
    view full answer...
    Image 1 for
  • 5th Wheel Hitch Install Kit for 2014 Ram 3500 Crew Cab Long Bed
    According to my Reese representative, with the 2014 Ram 3500 you need to use one of the Custom Install Kits, such as part # RP50085-58. The custom install kit doesn't require any holes be drilled into the truck frame (just up through the bed to join the rails to the frame brackets). The RBW Lil Rocker is compatible with industry standard bed rails, so it will be compatible with the bed rails supplied with the kit I recommended above. If you don't already have a 7-way installed in...
    view full answer...
  • 5th Wheel Installation Kit for a 2015 Ram 3500 Dually Short Bed
    As long as your 2015 Ram 3500 dually short bed does NOT have the 4 pucks (factory 5th wheel prep package) then you will be able to install a 5th wheel installation kit such as # RP50085-58. I do believe that models that do not have the prep package all have that beefy cross member that you are referring to. I have included a link to the installation instructions for you.
    view full answer...
  • Can Trailair Rota-Flex Pin Box be Used With Andersen Ultimate on 2021 Ram 3500
    You can use a Trailair like # LC158778 with the with the Andersen Ultimate Connection 5th Wheel Trailer Hitch System with Adapter # AM3200, or for a Trailair Rota-Flex pin box like # LC328330 it would need a lockout kit from Andersen in order for it to be compatible as this prevents rotation that would cause damage. I have added a link below to our selection of Trailair pin boxes for you in order to find the correct replacement. Having said that, while the Andersen can be used, it is...
    view full answer...
  • 2014 RAM 3500 Dually Fifth Wheel Rail Kit and Air Suspension Enhancement Recommendation
    Yes, you can install air suspension enhancement on your 2014 Ram 3500 and have a fifth wheel hitch installed. Firestone has confirmed that their kit part # F2579 (2 wheel drive models) and their part # F2560 (4 wheel drive models) will fit your truck and will allow a fifth wheel hitch to be installed at the same time. The Reese Select Plus fifth wheel hitch part # RP30081 that you referenced would be an excellent choice for a hitch, but for a rail kit to install this hitch you would...
    view full answer...
  • Fifth Wheel Rail Kit Recommendation for a 2015 Ram 3500 to Install 22k Reese Fifth Wheel Hitch
    To install the Reese 22k Fifth Wheel Hitch part # RP30033 in your 2015 Ram 3500 without the factory rail kit will only require you to install the correct fifth wheel rail kit. For that you would want the custom install kit that will minimize drilling on your vehicle and will cut install time considerably. For that you would want part # RP50085-58.
    view full answer...
  • Recommended 5th Wheel Hitch for MORyde Orbital Pin Box on 2019 Forest River Arctic Wolf
    The MORyde pin box RSPB83-1622 is a 16K orbital rotating pin box designed for increased turning clearances with short bed trucks. Although this nice feature is not required for a long bed truck like your 2017 Ram 3500 I recommend keeping it. The Lippert Center Point suspension # LC1565391 will handle much of the road shock, so I recommend keeping your additional turning clearance and simply using a really nice 5th wheel hitch. If you have the factory puck system in your Ram, I recommend...
    view full answer...
  • Reese Fifth Wheel Rail Kit that Fits 2020 Ram 3500 without OEM Rail Kit
    Reese has fifth wheel rail kits that fit your 2020 Ram 3500 but due to the design of the truck you'd have to use a custom fit since none of the universal kits fit the truck. So Reese has the # RP50085-58 which is a fit that would be a much better option than a universal kit as it does not require frame drilling and also minimizes install time.
    view full answer...
  • Fifth Wheel Hitch Rail Kit for Husky Hitch in Bed of 2016 Toyota Tundra 6.5 ft Bed
    For a set of fifth wheel rails that fits your 2016 Toyota Tundra with a 6.5 foot bed the best option is a custom install kit as it will minimize drilling and install time. For that you'd want the Reese kit part # RP50085-58 which is a fit for your truck and also provides the style of rails that your Husky hitch requires. Husky makes a universal style rail kit that fits your truck too but since it will be a much more difficult install and the Reese kit works just as well it would be your...
    view full answer...
    Image 1 for
  • Can a Single Attachment Point B&W Companion 5th Wheel Hitch be Used with a Sidewinder Pin Box
    You actually shouldn't be using a B&W Companion hitch with a Sidewinder at all. The problem is because of the single attachment point and the force applied to the hitch from the Sidewinder it could cause the gooseneck hitch under the bed to get damaged or even break free causing the whole assembly, including the Companion, to rotate. The only difference between the regular Companion and slider is that the slider can slide back to allow more clearance between the truck and trailer when...
    view full answer...
  • Recommended Fifth Wheel Hitch for 2018 Ram 3500 with RamBox
    For your 2018 Ram 3500 with RamBox, I recommend the Reese Quick-Install Custom Installation Kit w/ Base Rails for 5th Wheel Trailer Hitches # RP50085-58 to give you custom mounting brackets for your vehicle and industry standard rails compatible with most 5th wheel hitches. For your 5th wheel hitch, I recommend the Reese Select Plus 5th Wheel Trailer Hitch # RP30081 which will work very well with these rails and will give you a very strong and reliable hitch. I've attached a few videos...
    view full answer...
  • Will Demco AutoSlide 5th Wheel Hitch Fit with B&W Turnoverball Gooseneck Hitch?
    The Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 21,000 lbs # DM8550035 is not compatible with the B&W turnoverball gooseneck hitch # BWGNRK1314. The handle for the gooseneck ball will not work with the 5th wheel rails in place according to my contact at B&W. Unfortunately you will need to choose between them. If you go with the above bed rails, I recommend the Reese Quick-Install Custom Base Rails and Installation Kit for 5th Wheel Trailer...
    view full answer...
  • 5th Wheel Base Rails & Brackets That Fit 2021 Ram 3500 With 8 Foot Long Bed
    While we do have a base rail and bracket kit that fits your 2021 Ram 3500 with an 8 foot long bed, the parts you mentioned won't fit as they are for certain Ford trucks. So instead, the base rail and custom brackets that will fit your 2021 Ram 3500 are the following: - Reese Quick-Install Custom Installation Kit with Base Rails # RP50085-58 I verified with the manufacturer, Reese, that these do in fact fit your 2021 Ram 3500, and are the best option because they do not require any...
    view full answer...
  • Reese Quick-Install Custom Bracket Kit for a 2018 Ram 3500 with a 6-1/2' Bed
    The correct Reese Quick-Install Custom Bracket Kit for a 2018 Ram 3500 with a 6-1/2' bed is the part # RP50085. The part # RP50054 is only a fit for a 2018 Ram 2500. We have the complete base rail kit available as part # RP50085-58 but if you already have the Base Rails # RP58058 then you would just need the Bracket Kit # RP50085 and the Replacement Hardware # RP58430 since the hardware is only supposed to be torqued to specs one time.
    view full answer...
  • Will the B&W Companion Work With Sidewinder On 2018 Ram 3500 with RamBox
    I do have an option for you but in order to tow a fifth wheel trailer using a truck with RamBox like a 2018 Ram 3500, you'll have to go with a pin box with rotating turret as that's the only way to clear the bed sides. Pin boxes with rotating turrets like the Reese Sidewinder cannot be used with gooseneck to fifth wheel adapters like the B&W Companion. Therefore, the only option would be a new fixed fifth wheel hitch. I recommend the Reese M5 5th Wheel Trailer Hitch part # RP30928 with...
    view full answer...
  • Availability of Valley Industries 5th Wheel Hitch Underbed Mount for 2017 Ram 3500
    I have an under bed option for you, but since Valley Industries went out of business about 5 years ago (2012) they have not produced any underbed kits that will work with your sliding Valley Industries 5th Wheel Hitch on your 2017 Ram 3500. The only under bed rail system that is available for your 2017 Ram 3500 with a 6 foot bed is the Demco Custom Install Below Bed Rails # DM8551006. These rails are only compatible with the Demco Autosliding 5th Wheel Hitches. You can either use the...
    view full answer...
  • Can 2018 Ram 3500 with Ram Box Tow Fifth Wheel Trailer.
    The problem with the Ram Boxes is that they make the bed rails so narrow that you can't make turns with a fifth wheel trailer even if you are using a Goose Box. Normally we have to recommend people use a Sidewinder pin box replacement as it's the only pin box that pivots higher and prevents interference with the Ram Boxes. Since you are installing a Goose Box that means you'd have most likely the Lippert 1621 style pin box and the Sidewinder you'd need is part # RP34FR or you have the...
    view full answer...
  • 5th Wheel Trailer Hitch Installation Kit for 2015 Ram 3500 Dually and Reese Hitch
    As far as fits go the situation was that on Curt kit # C16430-204 they had excluded dually models. But we have installed this kit on a dually model and have been told by Curt recently that it will fit. So if your 2015 Ram 3500 does not have the factory prep package for a 5th wheel hitch, you should be able to use this Curt kit. And your Reese hitch will fit it. But I can tell you that Reese installation kit, # RP50085-58, will fit dually models for sure and your hitch will fit this installation...
    view full answer...
  • What Is The Difference Between PS30133 and PS30121
    The difference between the Pro Sereis # PS30133 and the # PS30121 is that the PS30133 includes the rail kit. They are going to be the exact same hitch but the difference in price is that a basic mounting rail kit is included. If you wanted a custom installation kit for your 2014 Ram 3500 that will install with minimal drilling you'll want to use the Reese # RP50085-58, which will also put industry standard rails in your truck bed that allow you to mount a 5th wheel hitch.
    view full answer...
  • Custom Fit 5th Wheel Base Rails and Installation Kit for 2015 Ram 3500
    The 5th wheel hitch base rails and custom installation kit I recommend for your 2015 Ram 3500 is the Reese Quick-Install Custom Base Rails and Outboard Installation Kit # RP56010-53. The custom installation brackets will not require you to drill into your vehicle's frame, and the outboard orientation of the brackets will make it easier to access the installation hardware. These base rails are industry standard rails, so they will work well for your Husky 24K 5th Wheel Hitch. If you're...
    view full answer...
  • Parts Needed to Install Draw Tite Fifth Wheel Hitch in Bed of 2019 Ram 3500
    The Draw Tite hitch you have was designed to fit industry standard fifth wheel rails so if your 2019 Ram 3500 has the OEM rail kit you'd need the part # RP30156 to install the hitch or if you didn't have the rail kit you'd need the custom rail kit part # RP50085-58 and you'd be set.
    view full answer...
  • Recommended 5th Wheel Hitch And Sidewinder For A 2021 Ram 3500 With RamBoxes
    I still recommend using a rotating pin box due to your 2021 Ram 3500 having RamBoxes. The weight capacity of the pin box and the 5th wheel hitch are the other important factors here. Since you don't have a camper yet you don't know what the GVWR is. The Reese 5th Wheel Trailer Hitch # RP30047 I recommended before has a GTW of 16,000lbs and the Reese M5 5th Wheel Trailer Hitch # RP30928 has GTW 20,000. You can always go high and get the heavier weight capacity hitch but it will cost...
    view full answer...

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