How Many Spacers to Use with Demco Rail Kit Adapter part # DM6004
Updated 01/27/2026 | Published 08/25/2024 >
Question:
I bought the demco adapter for my 21 f250 puck system. Can you tell me which spacers to use so I dont have to keep taking the hitch out and take it apart to put the others on?
asked by: Ed
0
Expert Reply:
I wish there was an exact number of spacers to use when installing the # DM6004 but due to variances in vehicles you'll have to trial and error the amount and type to use that will give you the best fit.
expert reply by:
Jameson C
0
Product Page this Question was Asked From
Replacement Side Plates for Demco Autoslide 5th Wheel Trailer Hitches - Underbed Mount
- Accessories and Parts
- 5th Wheel Hitch
- Plates
- Side Plates
- Autoslide
- Demco
more information >
Continue Researching
- Q&A: 2023 Chevy Puck System Replacement Side Plates for Demco Autoslide 5th Wheel Trailer Hitch
- Q&A: What is Overall Height of Demco Rail Kit Adapter 6333 in Bed of 2026 GMC Sierra 2500
- Q&A: Can Older Autosliding Hijacker Fit with Side Plates # DM6033 for Ford OEM Puck System
- Q&A: Adapter to Install 18K Demco Autoslide 5TH Wheel Hitch In Bed of 2024 Ford F-250 with Puck System
- Q&A: Parts Needed To Use Old Demco Autoslide On New 2025 Chevy Silverado 2500 Crew Cab 6.5' Bed
- Q&A: Can Slider Fifth Wheel Hitch Be Used in Long Bed Truck
- Q&A: What Are Mounting Puck Dimensions of Demco Hijacker UMS Series Gooseneck Trailer Hitch
- Article: Gooseneck to 5th Wheel Adapters
- Article: 4 Steps to Choosing Your 5th Wheel Pin Box
- Article: Steel vs. Aluminum Ball Mounts
- Article: Trailer Wiring Diagrams
- Article: Best 2018 Trucks for Towing a 5th Wheel


Jameson C.
1/27/2026
Hey, how did things go with finding the right number of spacers for your F-250’s puck system? Once you got the fit dialed in, did the hitch stay snug without extra adjustments? Your update could make it easier for others working with the same adapter.