Decode the VIN. Inspect the evidence.
This truck and trailer VIN decoder validates all 17 positions, preserves model-year ambiguity, and resolves a vehicle platform only when VIN-prefix evidence clears the published support and purity floor.
Evidence and legal guardrail
Decoded platform claims are inferences, and every published claim retains its source and confidence. Derived from manufacturer coding tables and our own decoded corpus; not an official government decode.
“Not established” means the available evidence did not establish the field. It never means the vehicle has no such attribute or that no data exists elsewhere.
Decode result
Normalized VIN: 7M3GU4021SNDT6409
Deterministic structure
These fields come directly from VIN positions and the published checksum calculation, with zero store IO.
Position 10 repeats every 30 years; both candidates are retained and neither is silently selected.
Not asserted outside North American WMIs; positions 12–17 may follow another regional convention.
No source established for this field.
Sourced platform inference
The prefix store publishes only at support ≥ 3 and purity ≥ 90%. Prefix confidence is shown beside every established platform claim.
DAVIDSON TRAILERS, LLC Davidson Trailers, LLC
146 decoded VINs at 100.0% prefix purity.
Prefix basis · 146 decoded VINs at 100.0% prefix purity.
Prefix basis · 146 decoded VINs at 100.0% prefix purity.
No sourced model-line label is established.
No source established for this field.
No sourced generation label is established.
No source established for this field.
No sourced cab label is established.
No source established for this field.
Not established
- serial sequence (positions 12–17 are only asserted for North American VINs)
- model line
- generation
- cab type
These are withheld claims, not negative findings.