Structural Interior System
Stop Engineering.
Start Building.
An integrated wall, ceiling, and framing system
for the RAM ProMaster.
A Structural Interior System, Not a Panel Kit
Most ProMaster interior kits are a stack of raw, unfinished panels with no mounting holes drilled. Building the structure that holds a bed, a galley, or a loaded upper cabinet is left entirely to you.
Inertia solves this problem with a complete, integrated system that covers the walls and ceiling as one engineered assembly: a machined steel skeleton indexed to the ProMaster's factory chassis points, rot-proof furring and Formica-laminated panels, and GoCode trim to finish the complex curved sections of the van.
The ProMaster Interior System provides the structural framing, the walls, and the ceiling, and it is the base that the rest of the build attaches to.
Three Layers, One Assembly
The system is built in three layers. The framing carries the load, the panels finish the interior, and the trim closes the edges. The framing is the structural core of the system.
A Continuous Steel Plane, Not Swiss-Cheese Sheet Metal
Anyone who has mounted anything in a van knows the problem: van bodies are thin, curved, and full of holes, and the solid metal is rarely where you need a fastener. You end up hunting for backing, adding your own, and hoping it holds.
Inertia gives you a continuous steel plane instead. A cabinet, bed, or galley mounts exactly where the design calls for it, into engineered hardpoints rather than wherever the van happens to have metal.
Some framing kits address this issue with wood, using plywood lattices or near-full sheets bonded to the walls. Steel gets the job done with far less wasted space and with fewer long-term issues:
- Volume. Steel framing is a fraction of the thickness of wood, which preserves the interior width and headroom that thick framing would otherwise consume.
- Weight. A wood lattice adds significant dead weight, while thin steel carries the same loads at a fraction of the weight.
- Moisture. Plywood takes on water at every cut edge, especially if those edges are not properly sealed, and can swell, rot, or mold over time. Steel and PVC do not.
- Movement. Wood expands and contracts with temperature and humidity, while steel holds its dimensions.
One Build In, and We're Just Getting Started
- The first build is finished and sold. We designed, fabricated, and installed it in a full ProMaster 159 high-roof owner build, and it is now in the field.
- Production is in-house. We cut the kits on our own CNC equipment.
- A complete, step-by-step installation manual ships with every kit. The system was engineered for assembly from the start, working backward from how it goes together to the geometry of each part.
- A matching floor system is available in tiered materials, from marine-grade plywood to Coosa Bluewater, a structural fiberglass-composite panel that is over 30% lighter than plywood and will not absorb water, rot, or swell.
- The production version is being installed this July and will be ready in August, with further design refinements to speed up assembly time.
- It will be shown at van expos this fall, as a finished build that visitors can walk through.
- Platform roadmap: the 159 high-roof is the first configuration; the same engineering will extend to other ProMaster sizes such as the 136 and 159 extended, and then to the Transit and Sprinter.
A Finished Van, Under One Roof
Inertia is the core of a larger collaboration. Together with our partner network, we can take a bare ProMaster all the way to a finished, road-ready build without the customer having to manage a stack of separate vendors:
The customer works through a single point of contact and one build schedule to finish the entire van. For a partner, this means your product joins a pipeline that can finish the whole vehicle around it, not just a single build done alone.
Build onto the Foundation
In a bare ProMaster, your product mounts to thin, unpredictable factory sheet metal. Inertia replaces that with a continuous steel plane and engineered hardpoints, giving you a known, repeatable structure to design and mount to.
For partners who integrate early:
- Your product in the build, both brands on the van. We install it in the production-version demo and show it as an integrated package at van expos this fall.
- Professional content you can use. We photograph your product in a real, finished build and license the images for your own marketing.
- First in line as we grow. As we open new platforms, from more ProMaster configurations to the Transit and Sprinter, you get priority integration, an early look, and a say in the mounting standard your category designs to.
There is no exclusivity, no equity, and no cost to you.
The ProMaster Structural Interior System is a complete interior of steel framing, machined panels, and trim, engineered as one assembly and indexed to the van. It is priced at $9,995 and typically ships in two to three weeks. The first build is in the field, and the production version will be ready this summer and shown at van expos in the fall.