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Demco Autoslide Capture Plates for Trailair Rota-Flex Pin Boxes

Demco Autoslide Capture Plates for Trailair Rota-Flex Pin Boxes

Item # DM6171
Our Price: $69.34
Accessories and Parts
Shipping Weight: 7 lbs
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Replaces the capture plates on your Demco Autoslide fifth-wheel trailer hitch so that you can use it with a Rota-Flex pin box. Plates prevent the king pin from rotating inside your trailer hitch. 1-800-940-8924 to order Demco accessories and parts part number DM6171 or order online at Free expert support on all Demco products. Great prices and Fastest Shipping for Demco Autoslide Capture Plates for Trailair Rota-Flex Pin Boxes. Accessories and Parts reviews from real customers.
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  • Reviews (95)
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  • Videos (1)
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Demco Accessories and Parts - DM6171

  • Fifth Wheel Hitch
  • Plates
  • Capture Plates
  • Demco

Replaces the capture plates on your Demco Autoslide fifth-wheel trailer hitch so that you can use it with a Rota-Flex pin box. Plates prevent the king pin from rotating inside your trailer hitch.


  • Capture plates prevent your king pin from pivoting inside your Demco Autoslide 5th-wheel trailer hitch
    • Required for use with your Trailair Rota-Flex pin box
    • Also works with Trailair Air Ride pin boxes
  • Fast and easy installation
    • Brackets replace capture plates that came standard on your hitch and secure with existing hardware
  • Made in the USA
  • 5-Year limited warranty

6171 Demco Hijacker Auto Slide Locking Plates for Trail Air Rotaflex Kingpin Boxes

Installation Details DM6171 Installation instructions

Video of Demco Autoslide Capture Plates for Trailair Rota-Flex Pin Boxes

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

Video Transcript for Review of Demco Fifth Wheel - DM6171

Today, we're going to take a look at the Demco Hijacker Autoslide capture plates for the Trailair Rota-Flex Pin Boxes. Now, these capture plates will prevent your king pin from pivoting inside your Demco Hijacker Autoslide Fifth Wheel Trailer Hitch, and these are required for use with the Trailair Rota-Flex pin box, but they will also work with the Trailair Air Ride pin boxes. They are a fast, easy installation. Comes with a nice set of instructions on how to install them. Basically, these brackets will replace the capture plates that come standard on your hitch, and they secure with the existing hardware. These capture plates are actually taller and longer than the factory capture plates on your hitch, which allows the auto function of the hitch to operate without a delay.

These parts are made in the USA. But that should do it for the review on the Demco Hijacker Autoslide Capture Plates for the Trailair Rota-Flex Pin Boxes..

Customer Satisfaction Score:

Customer Reviews

Demco Autoslide Capture Plates for Trailair Rota-Flex Pin Boxes - DM6171

Average Customer Rating:  4.9 out of 5 stars   (95 Customer Reviews)

Replaces the capture plates on your Demco Autoslide fifth-wheel trailer hitch so that you can use it with a Rota-Flex pin box. Plates prevent the king pin from rotating inside your trailer hitch.


Thanks for having this hard to find product, it would have been nice if the salesman at the RV dealership would have known I needed to upgrade to the larger capture plates but your website was so helpful even providing a video that answered all my questions. Product was delivered faster than expected and was just what I needed. Thanks


They look good. I'll be more frank on how they fit and work are after installation.


This tightens the contact with the rota flex!


The stock guide plates will work. That being said, these help so much more! The are taller and longer. This guides and captures the kingpin better. By covering more of the king pin with these rails it allows the auto function of the hitch to operate without a delay. The delay in operation was something I experienced with the stock rails. That is what caused me to start searching for something better. Happy to have found these!

Tony S.


After a year and lots of towing miles later, they are still working great!


They fit perfectly on the Demco autoslide. They are quite a bit larger so they will contact the rigid part of the rotoflex pinbox.



These are still working perfectly. I have decided it is easier to take them loose every time I hook up, then snug them after hooking. Just the design of the autoslide mot the capture plates.


everything works great , on the hitch head underneath there's a blue stopper for letting the head stop, they keep splitting and I have call Demco support on this problem and I have paid for a couple and they I sent me a couple at no charge. Have to change one about very two campground stop. Very upsetting do have to do this.If you have any questions please let me know .


I’m always impressed by etrailer product knowledge, service and prompt delivery. Not my first purchase nor my last.


Item was delivered on time by UPS.


Super fast shipping, overall a great product. Highly recommend!


Awesome transaction


etrailer is always great to work with and their help with these capture plates for my pin box is yet another example of that. That said, like some of the other reviews that I read prior to purchasing these plates, I wonder why Demco doesn't just put these on from the factory. They are awesome and would work great with or without the flex pin box.

Thanks etrailer.



We’ll, here we are after a year and my Demco capture plate are still working perfectly. I highly recommend them.


Great price and even sipped before the said date. I was emailed that my product was shipped early and the I received another email saying that it was delivered. I was well taken care of for the whole process. Great company


Easy installation onto my Demco Hijacker Autoslide 18K and a much easier and safer looking connection to my Denali with the Trailair Rota-Flex Pin Box.

Gary P.


Satisfied. Makes connection much easier


I don't understand why these are not the standard capture plates shipped with the hitch. They would work for all uses just fine.


Solid product, large and thick. Easy to install and line up.


Purchased the Demco Hijacker Autoslide 5th Wheel Trailer Hitch w/ Slider - Single Jaw - Above Bed - 18,000 lbs
Item # DM8550034 for our Nissan Titan XD pro4x. After reading about 5th wheel pin boxes, I call to see if the factory capture plates would work for our new Keystone Cougar Pinbox. I called, spoke with Cailee V in customer service. Cailee was not 100% sure. She got my information, called Keystone to see how the pin boxes were set up. She followed back up with me the next day and advised I needed to purchase the capture plates for the roto-flex pin box. Order and they arrived in 2 days. Fit my hitch perfectly. Great Customer Service, thank you Cailee, great hitch/mounting bracket and capture plates.


Hitch arrived in excellent condition. I was a little disappointed at how long it took to arrive, but with the pandemic going on, I understand. This is an excellent hitch. It definitely requires a second set of hands to drop it into the puck mounting system in the truck. My wife and I picked our 5th wheel up this past Saturday and brought it home to get it cleaned up for our trip. Very smooth and very quiet. Much better than our last manual sliding hitch. The only negative from me is that I was missing 2 of the pins that hold the arms in the locked position. Supposed to be 4 and we only had 2.


used with new hitch. Easy to set up and have had no problems getting hooked up.


Perfect with my replacement head. important with Trailair Flex Air 5th Wheel Pin Box equips my FW.


These look much more substantial than the original ones. I have not actually used them yet but believe they will work very well.


Fit perfectly into the Demco Hijacker Hitch.
to install.

Shipping was extremely fast from etrailer / Mariah A. (thanks for that)


these are wider to cover more of the catch plate. great investment. I feel safer that more of the catch plate is covered. well worth it.



Great, no issues at all.


Truth be told, I have not used this yet, but have installed it on the hitch. While it was a little hard to take the old guides and install the new ones, I am sure these will work just fine. Both Demco and etrailer are standup companies.


Better than what comes on the hitch. Very large gives piece of mind. Work great


Much bigger than the stock capture plates. Simple plug and play and easy to hook up to the Rotaflex kingpin on my trailer.

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Info for this part was:

Employee Lindsey S
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