Do I Need a Locking Plate to Use a Curt Helux Pin Box w/ a Demco Autoslide?
Updated 11/02/2025 | Published 10/31/2025
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Question:
Are locking plates need for Curt Helux Coil-Spring 5th Wheel Pin Box?
asked by: Martin P
(click to enlarge)
Expert Reply:
Yes, they are Martin and thanks for the picture. You will need a locking plate to use a Demco Autoslide 5th Wheel Hitch like item # DM8550024 with a Curt Helux pin box.
The correct one is the Demco Autoslide Locking Plate for Lippert Helux Pin Boxes item # DM53KV. This will keep the king pin from rotating inside your Demco Autoslide 5th wheel hitch. I attached a screenshot from the instructions so you can see how to get it setup.
The Demco Autoslide 5th Wheel Hitch w/ Slider item # DM8550024, you were looking at, is designed to fit the Ford F-250's and F-350's with the factory puck system.
What year and model is that Keystone you're looking at?
(click to enlarge)
Product Page this Question was Asked From
Demco Autoslide 5th Wheel Hitch w/ Slider - Single Jaw - Ford Super Duty Prep Package - 18K
- 5th Wheel Hitch
- Sliding Fifth Wheel
- OEM - Ford
- 4500 lbs Vertical Load
- 18000 lbs GTW
- Double Pivot
- Premium - Single-Hook Jaw
- 15-1/2 - 18-1/4 Inch Tall
- 14 Inch Fore/Aft Travel
- Demco
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Martin
11/2/2025
Thanks for the reply Jerred. I order a F250 with the 5th wheel/goose-neck prep. I'm looking at the Cougar 26RES. This is my first 5th wheel. I'm planing on adding air helpers and larger rear sway-bar. Anything else I should consider?