Stoughton trailer VIN decoder,
from the NHTSA record.

A World Manufacturer Identifier is the first three characters of the VIN. NHTSA assigns each one to a manufacturer, and vPIC records the vehicle type and country it was issued for. The code below is the ones verified for Stoughton in vPIC: 1DW. The list is built from the manufacturers the VINs sampled for this page decode to, and NHTSA can have issued Stoughton other codes for other plants and vehicle types. All of them appeared in the 148 Stoughton VINs sampled from FMCSA roadside inspection records for this page.

1DW1A5324RBB46895 is a Stoughton trailer recorded in a roadside inspection and decoded clean by vPIC. Reading it left to right:

• Positions 1 to 3, 1DW. The WMI. vPIC resolves it to STOUGHTON TRAILERS, LLC, filed for trailers and assigned to United States.
• Positions 4 to 8, 1A532. The vehicle descriptor, whose meaning Stoughton's manufacturer defines in its filing. For this VIN vPIC read body class Trailer, trailer type Kingpin and length 53 from these five characters.
• Position 9, 4. The check digit, computed from the other sixteen characters. vPIC reports this VIN with error code 0, so the digit calculates correctly and the VIN was read right.
• Position 10, R. The model year code. vPIC decodes it as 2024. vPIC flags the code as ambiguous for this filing (year codes repeat every 30 years), so confirm against the certification label.
• Position 11, B. The assembly plant. vPIC names Brodhead, Wisconsin, United States.
• Positions 12 to 17, B46895. The production serial. It identifies the unit and decodes to nothing on its own.

vPIC's own pattern for this unit is 1DW1A532*RB: the positions it decoded from, with the check digit masked. Two Stoughton VINs that share that pattern share every attribute vPIC filed for it and differ only in the check digit and the serial.

Two reads of the gross vehicle weight rating, both from the federal record. First, what the manufacturer registered with NHTSA:

• STOUGHTON TRAILERS, LLC. Registered with NHTSA in Stoughton, Wisconsin, United States as Completed Vehicle Manufacturer. Registered vehicle types: Trailer, Class 6: 19,501 - 26,000 lb (8,845 - 11,794 kg) to Class 8: 33,001 lb and above (14,969 kg and above). 148 of the sampled Stoughton VINs decoded to it.

Second, the sample: vPIC returned no GVWR class for any of the 148 Stoughton VINs decoded for this page. For trailers that is the norm. The rating is on the certification label on the unit, not in the builder’s VIN filing, so a decode cannot supply it.

• Trailer: 148 units

If the VIN is not to hand, the rating is on the certification label on the unit itself; how to find GVWR walks through where to look.

3 real Stoughton VINs from FMCSA's roadside inspection file, each decoded by vPIC with error code 0. Every field shown is what the manufacturer filed; a field that is missing was not filed for that pattern. Paste any of them into the decoder above to see the full card.

FMCSA's Inspections Per Unit file (data.transportation.gov, dataset wt8s-2hbx) records every vehicle in a roadside inspection with the make code the inspector typed. It holds 72,258 semi-trailer records under the code STOU and 62,716 semi-trailer records under the code STOUGHTON. Native Base pulled 150 distinct VINs from those codes and sent them to NHTSA vPIC in batches: 150 came back, 148 decoded as STOUGHTON TRAILERS, and 140 with a clean error code. The decode, not the inspector's code, decides what a unit is, which is why the same make appears under several spellings in the file.

• Model years in the sample: 1987 to 2024.
• Plants vPIC named most: Stoughton, Wisconsin, United States (72), Brodhead, Wisconsin, United States (65) and Evansville, Wisconsin, United States (9).
• Vehicle types vPIC lists under the STOUGHTON TRAILERS make: Trailer.
• WMIs verified one by one through vPIC DecodeWMI; manufacturer registrations from GetManufacturerDetails. Fetched 2026-09-27.

The same record, page by page. The truck and trailer VIN decoder takes any VIN and explains what a decode returns; each page below carries one manufacturer's WMI codes, VIN pattern, GVWR classes and worked decodes.

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• Decode International VINs: WMI 3HS and 3HA, GVWR classes and worked examplesInternational VIN decoder →
• Decode Mack VINs: WMI 1M1 and 1M2, GVWR classes and worked examplesMack VIN decoder →
• Decode Western Star VINs: WMI 5KJ and 5KK, GVWR classes and worked examplesWestern Star VIN decoder →
• Decode Hino VINs: WMI 5PV and JHH, GVWR classes and worked examplesHino VIN decoder →
• Decode Isuzu VINs: WMI JAL and 54D, GVWR classes and worked examplesIsuzu VIN decoder →
• Decode Utility trailer VINs: WMI 1UY and 3UT, GVWR classes and worked examplesUtility VIN decoder →
• Decode Wabash trailer VINs: WMI 1JJ, GVWR classes and worked examplesWabash VIN decoder →
• Decode Great Dane trailer VINs: WMI 1GR, GVWR classes and worked examplesGreat Dane VIN decoder →
• Decode Hyundai Translead trailer VINs: WMI 3H3, GVWR classes and worked examplesHyundai Translead VIN decoder →
• Decode Vanguard trailer VINs: WMI 5V8 and 2SH, GVWR classes and worked examplesVanguard VIN decoder →

Checking the same unit against the FMCSA crash file? The VIN crash check takes the same 17 characters.