The King Series Six-Door Ford Super Duty Kit Brings OEM-Style Engineering To The Alumiduty

Six-door trucks have always stood out because they never came from the factory that way, but the next step for the segment may be less about attention and more about process. King Series is pushing that idea with a patent-pending six-door cab kit designed for 2017-2026 Ford Super Duty platforms, aiming to bring more consistency to a type of build that has traditionally depended on one-off fabrication and whatever methods an individual shop happened to use.

That matters because the 2017 model-year switch to aluminum-body Super Duty trucks changed the rules for stretched-cab conversions. Techniques that could be applied to older steel-body trucks no longer translated cleanly. Material behavior, panel alignment, door geometry, and structural considerations all became more demanding. In other words, building a six-door truck that looked right and held up long-term required more than simply extending a cab and smoothing the exterior.

Why The Super Duty Platform Is The Right Starting Point

The Ford Super Duty already brings most of what a six-door truck needs before the first cut is made. It offers heavy-duty towing capability, durable running gear, and the kind of payload and long-haul confidence that make sense for families hauling people, gear, campers, boats, or trailers. Diesel-powered versions especially fit the concept well because torque, range, and durability become more important as vehicle size and load increase.

What the good-looking factory truck does not provide is enough cabin space for very large families or groups that want to stay in one vehicle. That is the gap a six-door setup fills. Done correctly, it creates room for a legitimate third row without giving up the core strengths that make the Super Duty appealing in the first place.

The Engineering Shift That Separates The Better Builds

For years, six-door trucks lived in a part of the market where build quality could vary widely. Many were effectively custom metalwork exercises, and their long-term durability often depended on how well a particular builder handled alignment, structure, and finish work. That inconsistency is one of the biggest reasons the category has remained niche.

King Series’ approach is built around creating a more repeatable process rather than relying on improvised fabrication. Instead of heavily modifying stock components and using filler to make everything appear uniform, the company developed composite pieces intended specifically for six-door applications. Those include composite outer side panels, a one-piece extended roof, and patent-pending middle doors designed around factory hinge geometry and alignment points.

The one-piece roof is especially notable because it eliminates the need to join multiple roof sections, reducing the number of seams that would otherwise need to be finished and managed over time. On a truck expected to tow, travel, and rack up serious miles, fewer seams and more consistent panel construction can make a real difference in fit, appearance, and longevity.

Why Composite Construction Makes Sense Here

Composite materials offer several advantages for a six-door Super Duty build, particularly on aluminum-body trucks. They help reduce weight, eliminate corrosion concerns associated with mixed-material issues, and enable more consistent reproduction of complex shapes. They also reduce the need for excessive filler, which is often a problem area in custom bodywork-heavy conversions.

The company says its process also prioritizes structure before exterior finish. During the conversion, outside cab and roof sections are removed so the underlying metal structure can be welded from behind. Once the structural work is complete, the composite outer pieces are installed to bring the cab back together with tighter tolerances. That order of operations is a big part of what separates engineered conversion systems from cosmetic builds.

Drivability Still Matters More Than Appearance

A six-door truck can look impressive and still fail at the part that matters most: driving like a usable vehicle. Added length changes the equation, so frame extensions, weight distribution, suspension tuning, and overall balance all become critical. A truck built to carry several passengers and possibly tow at the same time has to feel stable and predictable rather than oversized for the sake of spectacle.

That is part of why the Super Duty remains such a logical foundation. The platform already starts with the chassis strength and work-truck capability needed for towing and hauling. A well-executed six-door conversion is really about extending that usefulness, not replacing it with something softer or less capable.

The Family Problem That Started It All

The original idea did not begin as a styling exercise. It came from a practical need. In 2010, a blended family of eight found itself constantly using two vehicles just to get everyone to the same destination. That worked logistically, but it split up the travel experience and highlighted a gap between people-moving convenience and heavy-duty truck capability. A minivan could add seats, but it could not deliver the same utility, towing ability, or long-trip confidence as a Super Duty.

Founder Chad Eddy used his welding and mechanical backgrounds to build the first six-door Ford F-250 to address that need. The project grew from a one-family solution into a business after other families responded strongly to the truck and saw the same value in keeping everyone together without sacrificing the capabilities of a full-size pickup.

Why Six-Door Trucks Are Still Relevant

This type of truck fills a gap that still exists. Large families, blended households, and people who travel with both passengers and trailers often outgrow conventional crew cabs. A properly engineered six-door pickup offers seating for up to nine, preserves towing and diesel capability, and allows the entire group to travel together in one vehicle.

That is what makes the six-door idea more than a custom-truck curiosity. At its best, it is a practical solution built around capability, comfort, and shared travel. And by turning that concept into a more standardized system for 2017-2026 Ford Super Duty trucks, King Series is making a case that six-door builds can be engineered products with repeatable results rather than rare one-offs.