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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 # RP50066-58
Our Price: $355.52
Fifth Wheel Installation Kit

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Reese Custom - RP50066-58
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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. 1-800-940-8924 to order Reese fifth wheel installation kit part number RP50066-58 or order online at Free expert support on all Reese products. Great prices 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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2013 GMC Sierra - 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
    • Compatible with overload springs
  • Kit includes custom brackets, rails and hardware
  • Compatible hitches: B and W Patriot, 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
  • 5-Year limited warranty

50066-58 Reese Custom Quick Installation Kit

Installation Details RP50066-58 Installation instructions

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

Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.

Video Transcript for Fifth Wheel Installation - 2012 GMC Sierra

Today on our 2012 GMC Sierra Denali well be installing the 5th wheel hitch, part number RP30081 and the Reese base rail kit part number RP50066-58. Our first step will be installing the rear base rail. We need to measure from the end of the truck bed to the back edge of the rear base rail. Once we get our length, well then measure side to side to make sure were center of the bed.Now that weve got our base rail in position we need to go ahead and mark the holes. Im going to use a color paint pen so that it really stands out for me. Now with my holes marked out, Im going to go ahead and take an eight inch bit to make a pilot hole.

Now that weve got all four pilot holes drilled out, were going to get underneath the vehicle, were going to take our side brackets and temporarily set them in position and check to make sure our pilot holes line up with the side brackets.Now with our pilot holes lining up with our side brackets, were going to start drilling out our holes to the final size. Well be using the step bit process where in each drill bit will be a little bit larger than the one before. Our next step is to go ahead and install our side brackets ,but in order to do that we need to put some hard ware in the frame.Well be installing a 5/8 carriage bolt and block. To put these into the frame well need to take our bolt leader, our pole wire and feed it into our attachment point for this application, we actually have a closer access hole than going out to the end of the frame. Its located just behind the fuel tank.

So now well take our block, slide it onto our pull wire and then thread on our bolt.With the bolt in position we can now go ahead and take them and feed them into the access hole into the frame. Once into the frame well go ahead and just pull them into position. Youll want to make sure that your carriage bolt locks into your block. Ill go ahead and leave my pull wire on until I get my second attachment point in place. Then well slide our side bracket on, remove our pull wires and install the remaining fasteners.Now we can add a 5/8 serrated washer with the teeth of the washer facing the hitch and then a 5/8 nut.

Well just install each of these fasteners finger tight until we get all of our hardware into position. Now we have our side bracket mounted on the drivers side, well go ahead and repeat the same process on the passengers side.Our next step would be to drop our hardware down through the rear base rail into our side brackets. However, on the passengers side well need to remove the exhaust heat shield first. To give us a little working room were first going to remove the two rear tailpipe hangers. With our exhaust hanger lowered, we can now go ahead and cut the heat shield out.

Were going to cut just in front of the rear support beam and just behind the hat channel next to the fuel tank.With that done, we can go ahead and take our torch fit socket and remove the two support screws. As you can, see we have greater access to the passengers side attachment points for our base rail. Now well go ahead and get back in the bed of the vehicle and drop in our carriage bolts for the rear base rail. Before I put my bolts in position, Im going to go ahead and take the U-shaped spacers that are provided to take up the space between the bed corrugations.Well go ahead and set them above the side bracket but underneath the bed. This will ensure that when we tighten down our carriage bolt, that we dont smash the corrugation in the bed. Now that were back in the bed well go ahead and put our base rail into position and take our two inch carriage bolts provided with our install kit and drop them into place.Now well go ahead and get underneath, were going to add a conical tooth washer, lock washer and nut to all four carriage bolts with the teeth of the conical tooth washer facing up. Well install each fastener finger tight until we have all our fasteners in place. Now with the fifth wheel head unit bracket and legs pre-assembled, well put our front rail into position and then use the fifth wheel assembly to center it up. Quick tech tip; I like to also go ahead and take the hold down pins and put them in position to verify that the base rail is center of the truck bed and with the fifth wheel head unit.Now we can go ahead and mark out our holes and drill out for the front base rail, just as we did for the rear base rail. And just as we did for the rear base rail, well drill out for the front base rail and check it against our side brackets. Alright, now with our pilot holes checked out were ready to go ahead and drill out to our final size and then well drop in our carriage bolt.Alright, With our holes drilled out well go ahead and reinstall the front base rail. Just like we did on the rear base rail, well need to install the U-shaped spacers to take up the space for the bed corrugation. Now well go ahead and get underneath, were going to add a conical tooth washer, lock washer and nut to all four carriage bolts.Alright, now with all our fasteners in place, well go ahead and tighten them down. Now with the base rails tightened down, well go ahead and tighten down the side brackets. Now that weve got all of our fasteners tightened down well go ahead and torque to specifications as indicated in the instructions. Now were ready to go ahead and torque to specification on our side brackets.We have two more attachment points to drill out. These will be the center base rail attachment points, well drill out the closest to the cab for the front base rail and it will be the inside closest to the cab for the rear base rail. Well go ahead and drill them out using the step bit process just as we did before. Alright, with everything drilled out well go ahead and drop our carriage bolts in place.Now well go ahead and get underneath and install our fasteners. Well be using the same setup as we did for the outer fasteners, the U block, the conical tooth washer, the lock washer and nut. Now that we have all our fasteners in place well go ahead and tighten them down and then torque to specifications as indicated in the instructions.Alright, now with all of our fasteners in place and torqued to specifications, we can go ahead and reinstall the exhaust. And there you have it for the installation of our fifth wheel hitch part number RP30081 with the Reese base rail kit part number RP50066-58 on our 2012 GMC Sierra Denali.

Customer Satisfaction Score:

Customer Reviews

Reese Quick-Install Custom Installation Kit w/ Base Rails for 5th Wheel Trailer Hitches - RP50066-58

Average Customer Rating:  4.8 out of 5 stars   (191 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.

2017 Chevrolet Silverado 3500

The installation instructions were detailed and clear. Did it by myself in about 4 hours. Inexpensive solution if you didn't get the 5th wheel prep package.

2011 Chevrolet Silverado

Received the product the very next day shipping was excellent. Boxes were well taped and secured and complete. This was installed on a 2011 Silverado 2500 HD with a 8 foot bed . My installation was straightforward ,followed the included directions , and it installed very easy. I only have two suggestions ,
Get the spare tire down and out-of-the-way and do whatever is necessary to get around the heat shield. I just cut a small section of mine away . I have done business with etrailer for about five years now. I use to price check and order everywhere off the Internet. I don't do that anymore because I always ended up back doing business with
For four reasons ... Best price around, quality products, great customer service from a live person, well packaged products with the fast shipping

2016 GMC Sierra 3500

Fast shipping!! Installed on a new 2016 GMC Sierra 3500 Denali. Only issue was the exhaust heat shield.. It must be removed for easier access to install hardware. It takes about 3 hours to install with one person. Otherwise no issues. E Trailer is great to do business with!! Thank you

2017 Chevrolet Silverado 2500

Installed on 2017 chevy 2500. Square washers for the 5/8 bolts were to big to fit through the acess holes in pickup frame. I had to fish them through a bigger hole further up the frame rail. Other than that, excellent products. Once I found etrailer, its the only place I shop for trailer products

2015 GMC Sierra 2500

I purchased the Reese dual jaw slider and install bracket kit. Everything arrived in three days in perfect condition. After watching the install video and reviewing the enclosed instructions I installed the assembly myself. It took approximately 4 hours . As you can see I also did additional steps, cutting the rubber bed mat to fit around the rails. Also undercoating the brackets to blend in the wheel wells. Etrailer is definitely the place to go for all your RV needs.


Kit was pretty easy to install. Definitely watch the video. Some of the bolts are in tight spaces. Overall very good kit. Well constructed.


Great product! Everything fit as it should. Customer service was great they help the entire way even when ups lost part of the shipment!

2019 Chevrolet Silverado 3500

Hi Carol.
I got the package. I hope
to install next week. I’m also looking to put a 5th wheel electrical plug in the bed. 2019 Chevy 3500 with the factory prep for the wiring harness. Do you have a correct fit kit to do this?

Etrailer Expert

Mike L.


We do offer a 5th wheel wiring harness for your 2019 Silverado 3500. Id recommend the Hopkins # 41157, which you can see by using the link provided below. The harness plugs inline right behind the 7-way installed on your trucks rear bumper, between the trucks factory harness and the existing 7-way.


I purchased fifth wheel hitch rails. They were worked great. We certainly put them through a strong test. Unfortunately we got stuck on a very muddy, greasy road on a hunt. The fifth wheel was leaning at an angle but the rails held! I was extremely relieved and happy that they did. Thank you etrailer.

Steve A.



2019 GMC Sierra

Rail Mounting kit arrived in perfect condition, with all required attachment hardware and special bolt insertion tool. All items fit up as advertised on my 2019 GMC 2500HD std bed Sierra. Completely satisfied.

Ralph K.


After a year since installation and several trips with my 5th wheel, Im still completely satisfied with this rail mounting kit, It has operated perfectly with my Andersen Ultimate Rail Mount Hitch.

2019 GMC Sierra 2500

The rail kit installation went smoothly. I did the complete installation alone just to see if I could complete it without any assistance from anyone. (The installation honestly took me about eight hours which included quite a few breaks!) The only difficult task for me was installing the two nuts and washers on the front two bolts on the LH Frame Bracket due to the tight clearance around the large diesel fuel tank on my truck. As some of other folks mentioned, removing the spare tire and exhaust system heat shield are a must for installing the rail kit this model truck. The quality of the components is excellent. My wife and I will be pulling our 5th Wheel to the Georgia Mountains with this hitch this weekend!

2016 GMC Yukon

Installed a Reese custom rail kit (RP50066-58) on my 2016 GMC Denali 4WD DRW. It took approximately 3 1/2 hours to get it completely installed. I had to remove the exhaust heat shield and drop the spare tire but once I did it gave me easy access to the hitch frame brackets. I found it very informative to watch the online video first and took the advise of another persons suggestion to tape over the holes in the top of the frame (it kept me from losing the nuts & washers down into the frame). I simply followed the written instructions that came with the kit and the hitch was installed with out any real issues. I will say it did come in handy to have someone to assist me with some parts of the installation (just to keep me from having to crawl in/out from under the truck to get tools etc). As a side note, if you had access to car lift it would make the installation much faster and easier. I didn't have access to one and it was a little tight but as I said it wasn't all that bad.

I would definitely recommend this product.


Frame brackets were a perfect fit and easy to install. Installing nuts on the rail's proved a little difficult on my vehicle 2018 GMC due to limited clearance over fuel tank and truck frame and exhaust shield (definitely a 2 person job). Otherwise I am perfectly satisfied with the quality of the kit and easy to follow instructions. I would recommend this kit.


Easily ordered and delivered promptly

2014 Chevrolet Silverado 3500

Rail kit was great and etrailer was great with fast and free shipping.
Only advice: I installed this kit on my 2014 Chevrolet 3500 and I would not do it again.
I'd spend the extra money and get the RP56001-53 kit...much much easier to install
If you have time and patience, it's worth the savings. Otherwise save yourself the tight quarters of trying to get to those bolts above the frame rails.
I suspect this kit was an earlier design that was or should have been superseded by the later one.

2013 GMC Sierra

Although the Rails won't be installed until my new truck comes in mid April, I fully expect the product to be as advertised. I was recommended to your site and product by salesman from major manufacturer of the 5th Wheel Hitch currently used.



Has been a year and Product has worked out just fine !!


An installation of brackets are never easy due to items in the way but following the instructions made it doable

2011 GMC Sierra

Excelent product. Made the install much easier than it needed to be. The video helped a lot. Access to some of the bolts were very difficult (ones above the gas tank). Dropping the spare tire made it easier. Biggest problem was removing the heat shield as on my truck the darn Torx screws stripped. I ended up cutting most of the heat shield off. Bottom line, this is a great product, very heavy duty and very versatile.

Jason W.


Still working great.

2017 Ram 2500

after getting the right fifth wheel suport kit for my 2017 chevy 2500 hd the insulation went in just as they say in the instructions thanks again etrailer for providing a product and service

2016 Chevrolet Silverado 2500

Excellent product. Installation of washers and nut on front passenger rail under bed a little difficult. Probably worth the extra cost to buy the outboard brackets and longer rails. Removal of spare tire required.

Etrailer Expert

Laura E.


Thanks for your review, Ron. We note that removal or lowering of the spare tire is only temporary.


Noah was awesome. It was so nice to actually speak to someone. He also knew the products and was very knowledgeable. I will be buying more from them!

2016 Chevrolet Silverado 3500

These rails were a perfect fit on my previously used 5th wheel hitch. I am installing them myself on my 2016 GMC 3500 Sierra. However, the time it has taken, has been longer than advertised. I am stuck with three unreachable bolts. I am 63 years old with arthritis, so it is a challenge. I am very pleased with the service that e-trailer has provided me on instructions. With them, Installing the rails is a straight forward project even for this rookie. I am not pleased with the box that the rails were shipped in. It was too large a box and the rails tore the box apart. The bag of ten bolts, nuts, washers and spacers was also ripped open. Fortunately all was accounted for.

2015 Chevrolet Silverado

I really appreciated the very informative videos etrailer provided for the install on my 2015 Silverado 2500. I was able to focus my efforts on the high degree of manual dexterity required to mount the rails to my truck without the assistance of a lift. It was a very rewarding experience and I was shocked to learn the positions I could get my aging body into under that truck.
Couple of Tips from me to the next guy:
1) Use electrical tape on lead wire coil and bolt. Too nerve racking pulling on that wire and hoping it wasn't going to yank free of the bolt.
2) When you go to install the washer, lockwasher, nut combination, put a piece of duct tape over the hole in the top of the frame. When (not if) you drop the nut it will bounce off the tape rather than making the nothing but net swishing sound on it's way into your truck frame.

Really solid hitch. I'm very satisfied with the purchase.


I received my order in a timely manner when I opened the order it was shot a package of hardware I called etrailer they immediately sent me the missing Hardware I'm very satisfied with my order thank you

2018 Chevrolet Silverado 2500

Kit was delivered quickly. Installation papers were very easy to follow. It was pretty easy to install with another set on hands. There were two areas on my 2018 Chevy 2500HD with the 6’-6” bed that are tough too get to(that’s when the extra hands come in great). I’m very please the product as well as the support from George J. Recommend fully!!!

Marc S.


It’s been great!! I would recommend your company and products to all my trailering friends!

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