The chassis number of a mobile home does not function like a car VIN. Confusing the two leads to dead ends, especially when trying to verify against the SIV databases or on standard VIN check sites. Understanding the structure of this coding and knowing where to physically read it on the structure allows for identifying the year of manufacture without intermediaries, or at the very least, asking the right question to the manufacturer.
Mobile home chassis coding and VIN standard: why confusion hinders research
French mobile home manufacturers have gradually aligned their internal coding with the 17-character VIN format used for towed vehicles. The number engraved or stamped on the chassis thus visually resembles a standard VIN.
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The difference is legal. A leisure mobile home remains classified as HLL (light leisure accommodation) and is not registered in the Vehicle Registration System. Running a query on an automotive VIN verification service with this number will yield no results, even if the format appears correct.
We recommend knowing how to verify the mobile home chassis number before any transaction, as the internal coding of each manufacturer incorporates the year of manufacture according to their specific conventions. For some manufacturers, the tenth character corresponds to the vintage, as in the ISO 3779 VIN standard. For others, the year is encoded in a block of characters specific to the model.
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Without knowing the manufacturer’s convention, the number alone is not sufficient. It is necessary to contact the manufacturer’s technical service (Trigano, IRM, Rideau, O’Hara, Louisiana) by providing the complete number to obtain the identification sheet of the mobile home, including year, model, and series.
Physical location of the identification plate on the chassis
The identification plate is not always in the same location depending on the manufacturer and the generation of the mobile home. We observe three main locations on site.
- The drawbar (or towing bar): this is the historical location. The plate is riveted or welded to the front part of the chassis, visible when facing the drawbar. On older models, corrosion may make reading difficult.
- The leveling plan, under the mobile home: some manufacturers place a second plate or direct stamping on a chassis beam, accessible only by going under the structure. Bring a flashlight and a telescopic mirror.
- The inside of a technical or kitchen cupboard: for several years, several brands (notably IRM, Trigano Residences) have added a modern identification plate inside, sometimes accompanied by a QR code. This plate includes the year of manufacture, the model, and the serial number, independently of the external chassis plate.
When the external plate is unreadable (corrosion, detachment, paint), the internal plate or the QR code provides a reliable alternative for tracing the year. This point remains very poorly documented in public content.
Absent or unreadable plate: the procedure to follow
If no plate is legible, direct recourse to the manufacturer is the only reliable option. Communicating the apparent model (written on the facade or in the sales documents), the dimensions, and any photo of the structure allows the technical service to identify the mobile home in its internal database.
We advise against relying solely on the seller’s statement. A discrepancy of a few years in the vintage changes the value of the property and its compliance with camping regulations.
Camping age limit: why the chassis number has become a transaction document
Verification of the chassis number is no longer solely a matter of technical curiosity. For several years, campground managers have required the communication of the chassis number and the exact year during a change of ownership on a site.
The reason is contractual. Most internal regulations set a maximum age for the mobile home, generally between fifteen and twenty years. A mobile home that exceeds this limit may be refused on the plot, which effectively nullifies the transaction for the buyer.
Some managers no longer rely solely on the documents provided by the seller. They directly contact the manufacturer using the chassis number to confirm the actual year. A seller who “ages down” their mobile home by two or three years in the listing thus finds themselves exposed as soon as the campground conducts this verification.
Cross-checking with manufacturer documents
The original invoice, the NF compliance certificate, and the technical notice all mention the year of manufacture. Cross-referencing these documents with the chassis number allows for detecting inconsistencies (chassis replacement, data entry errors, fraud). In the absence of an invoice, the manufacturer can issue a duplicate technical sheet upon presentation of the serial number.
QR code and new generation identification plate on recent mobile homes
Mobile homes manufactured in recent years gradually incorporate a QR code on the internal identification plate. This QR code links to a product sheet from the manufacturer, with the vintage, the exact model, and sometimes factory options.
The advantage is twofold. First, the QR code remains readable even when the external chassis plate is corroded. Second, it allows for instant verification on a smartphone, without calling the technical service.
This evolution is not yet widespread across the entire fleet. On a used mobile home over ten years old, the QR code will not exist. One must then revert to traditional methods: direct reading of the drawbar plate, contacting the manufacturer, or cross-referencing with sales documents.
For a used purchase, the safest approach remains to photograph the chassis plate, check for the possible presence of a QR code in the technical cupboards, and send these elements to the manufacturer before signing. A mobile home whose year cannot be confirmed by the manufacturer should be considered a risk.