Demco Autoslide 8550047
13,000 lb · Above-bed rails included
13K automatic slider supplied with industry-standard above-bed rails. Confirm truck-specific rail mounting brackets.
Demco Autoslide 13K vs 21K: Rails, Under-Bed & OEM Pucks
Demco Autoslide fifth-wheel hitches shift the trailer connection as the truck turns, helping manage cab-to-trailer clearance without a manual slider release. But the 13K and 21K models have different slide travel, and their mounting packages are not interchangeable. Start with the truck bed and its existing rail or factory prep system, then check trailer weight, kingpin type and clearances.
Three checks for the right Autoslide
Truck bed and hitch ratingDemco positions the 13K family for selected short-bed half-ton trucks, with up to 22½ inches of fore-aft travel and 2¾ inches of lateral travel. The 21K family offers up to 14 inches of slide travel and is generally aimed at approximately 6½-foot bed applications.
Bed mounting systemAbove-bed rail packages differ from under-bed UMS mounts and factory fifth-wheel puck systems. The 8550035 omits bed rails, whereas the 8550036 includes them. Ford, Ram and GM factory-prep versions have separate mounting plates.
Kingpin and turning clearanceDemco's automatic mechanism works with standard pin boxes without a separate locking plate in many applications, but certain suspension-style pin boxes require a specified locking plate. A 90-degree turn is not guaranteed with any Autoslide.
Truck fitment requires checking the exact configuration: Verify the vehicle's year, factory prep/puck layout, bed length, hitch mounting hardware, trailer pin box and manufacturer's towing ratings. An Autoslide's 13,000- or 21,000-pound nameplate does not increase the truck's payload, axle, towing or pin-weight limits.
Demco 13K vs 21K Autoslide MPN chart
The listed travel is the manufacturer's maximum slide travel, not a guarantee of clearance for every trailer and cab combination. A truck-specific installation kit or mounting brackets may be required even when a hitch package includes bed rails.
| MPN | Hitch rating | Slide travel | Mounting package | Product |
|---|---|---|---|---|
| 8550047 | 13,000 lb | Up to 22½ in | Above-bed rails included | View |
| 8550049 | 13,000 lb | Up to 22½ in | Under-bed (UMS) adapter plates | View |
| 8550035 | 21,000 lb | Up to 14 in | Above-bed rails NOT included | View |
| 8550036 | 21,000 lb | Up to 14 in | Above-bed rails included | View |
| 8550062 | 21,000 lb | Up to 14 in | Ram factory 5th-wheel prep/pucks | View |
| 8550038 | 21,000 lb | Up to 14 in | Ford factory 5th-wheel prep/pucks | View |
| 8550063 | 21,000 lb | Up to 14 in | Chevrolet/GMC factory prep/pucks | View |
Compare available hitch packages
13K Autoslide — short-bed applications
Demco Autoslide 8550049
13,000 lb · Under-bed (UMS) adapter plates
13K model designed for an appropriate under-bed mounting system, leaving the bed clear when removed.
21K Autoslide — above-bed and OEM-prep options
Demco Autoslide 8550035
21,000 lb · Above-bed rails NOT included
21K above-bed hitch package without industry-standard bed rails. Check the installed rails and brackets.
Demco Autoslide 8550036
21,000 lb · Above-bed rails included
21K above-bed package supplied with industry-standard bed rails; truck-specific brackets may still be required.
Demco Autoslide 8550062
21,000 lb · Ram factory 5th-wheel prep/pucks
21K package for approved Ram factory fifth-wheel prep systems, not standard aftermarket bed rails.
Demco Autoslide 8550038
21,000 lb · Ford factory 5th-wheel prep/pucks
21K package for approved Ford factory fifth-wheel prep mounts.
Demco Autoslide 8550063
21,000 lb · Chevrolet/GMC factory prep/pucks
21K package for specified Chevrolet/GMC factory fifth-wheel prep systems; check model year.
Fifth-wheel Autoslide questions
Does Demco 8550036 include mounting rails?
Yes. Demco lists 8550036 as a 21K above-bed package with industry-standard bed rails. Model 8550035 is the 21K above-bed package without those rails. Check which truck-specific rail brackets you need.
Can I put a Ram OEM-puck Autoslide into a Ford prep system?
Do not assume so. 8550062 is supplied for approved Ram puck systems; 8550038 is the Ford factory-prep version, and 8550063 is for specified Chevrolet/GMC factory-prep installations. Match the truck model year and puck layout.
How much does the 13K hitch slide compared with the 21K?
Demco lists up to 22½ inches of fore-aft travel plus 2¾ inches of side-to-side travel for the 13K family, versus up to 14 inches of sliding travel for the 21K family. Actual clearance also depends on the truck, trailer nose and pin-box location.
Do Autoslide hitches require a locking plate?
With a standard pin box, Demco generally does not require an additional locking plate to activate the slide. Some suspension or specialty pin boxes need an approved locking plate. Verify the exact pin-box model before towing.
Can an Autoslide always make a 90-degree turn?
No. Demco specifically cautions that trailer width, front-corner shape, truck cab, kingpin placement and mounting geometry can prevent full 90-degree turning clearance. Stop and verify clearance during tight manoeuvres.
Related Demco exploded-parts references
Already own an Autoslide? The following illustrated breakdowns help identify service components by hitch family rather than ordering an entire replacement hitch.
- Demco 13K Autoslide 6330 Fifth-Wheel Hitch Exploded Parts Guide
- Demco 18K & 21K Autoslide Hitch Exploded Parts Diagrams
Installation, hitch-to-rail mounting, pin-weight capacity and the correct locking plate must follow Demco's current model-specific instructions and the truck manufacturer's requirements.
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