Emery, South Dakota | December 9, 2025 | King Series, LLC., a leader in 6-door truck design and extended cab conversions, has filed design and utility U.S. patent applications for its groundbreaking 6-Door Cab Kit — the first standardized system engineered to convert traditional four-door trucks into
spacious, fully functional six-door vehicles.
For over a decade, King Series has built some of the most recognizable 6-door pickups in the country, known for their exceptional interior space, seamless OEM styling, long-distance durability, and factory-grade drivability. Now, the company’s patent-pending kit brings this capability to a broader audience — opening the door for personal owners, commercial fleets, custom builders, qualified body shops, and advanced DIY fabricators to produce a 6-door truck with predictable structural integrity and repeatable precision.

A New Standard in 6-Door Truck Design

Historically, 6-door conversions have required complex metalwork and proprietary door solutions. The King Series’ cab kit changes that. Each kit is built in the U.S.A. and designed for structural strength, ease of installation, and OEM-quality fit and finish. Kits fit 2017–2026 Ford Super Duty platforms, with
optional HVAC kits, wiring packages, and frame extensions available.

How the Conversion Works

King Series’ standardized process extends the OEM cab by removing the exterior panels, installing a reinforced mid-section for structural continuity, and integrating a patent-pending one-piece composite middle door built to factory hinge geometry and body alignment. Matching composite roof and side
assemblies restore rigidity and exterior uniformity, while HVAC, wiring, seating, and trim are reconfigured to maintain full OEM functionality. This system delivers a six-door layout that looks and performs like a factory extension.

What’s Included in the Cab Kit

• One-piece composite middle doors
• One-piece extended composite roof
• Composite outer side panels
• Weather seals, brackets, and hardware
• Build guidelines based on King Series’ process

Built for Shops, Upfitters, and Fabricators

The King Series Cab Kit provides a new market opportunity for:
• Qualified Body Shops
• Custom Truck Builders & Upfitters
• Advanced DIY Fabricators

Why It Matters

The 6-door truck market has long lacked consistency — with variations in structural methods, door solutions, and safety considerations. King Series’ patent-pending kit introduces a repeatable, OEM-inspired framework that elevates the entire industry.
Key advantages include:
• A standardized conversion platform
• Repeatable build processes
• U.S. made, patent-pending composite components
• A reliable method for shops to produce structurally sound 6-door trucks
• Expanded access for customers who want six doors without shipping a truck across the country

A Milestone for King Series

“This kit represents years of development and a vision to push beyond what anyone thought possible in the truck world,” said Chad Eddy, founder of King Series, LLC. “It’s not just about adding doors — it’s about expanding what trucks can do for families, work crews, and adventurers. We’re proud to say it’s
built right here in South Dakota and it’s patent pending.”

Availability

The cab kit will be available for:
• 2017–2026 Ford Super Duty (F-250, F-350, F-450, F-550)
• Gas or diesel platforms
• Long-box, short-box, SRW, or DRW setups

Media, distributors, and installers can request information at kingseriespickup@gmail.com or visit www.kingseriespickup.com.

About King Series Trucks
Founded in 2010 in South Dakota, King Series, LLC. has become the premier name in 6-door truck conversions. The company specializes in Ford Super Duty conversions, turnkey builds, and advanced composite solutions for modern aluminum-bodied trucks. With a dedicated R&D; team and a 26,000 sq. ft. production facility, King Series continues to redefine what full-size trucks can be.