Equipment unit · VIN-decoded · NHTSA vPIC

2028 Trailboss Trailboss Trailer

4S0DK4835W1000478 · Trailer · TRAILER
Carriers run under1
22 mo
Inspections4
all-time
OOS inspections2
of 4
First seenAug 4, 2023
AL
Last seenJun 7, 2025
AL
01

Decoded identity

From the 17-character VIN via NHTSA vPIC

VIN
4S0DK4835W1000478
Make
Trailboss
Model
Trailboss Trailer
Model year
2028
Body class
Trailer
Vehicle type
TRAILER
GVWR
Not decoded
Decoded at
Jul 14, 2026
vPIC returns make / model / year / body class / GVWR. Fields it does not resolve are shown as Not decoded rather than guessed.
Decode evidence & sources

Deterministic structure

These fields come directly from VIN positions and the published checksum calculation, with zero store IO.

World manufacturer identifier
4S0

Deterministic · VIN positions 1–3.

Vehicle descriptor section
DK483

Deterministic · VIN positions 4–8.

Check digit
5 · valid

Deterministic · position 9; calculated value 5.

Model year candidates
1998 or 2028

Position 10 repeats every 30 years; both candidates are retained and neither is silently selected.

North American serial sequence
000478

Deterministic · positions 12–17 for a North American WMI.

Sourced platform inference

The prefix store publishes only at support ≥ 3 and purity ≥ 90%. Prefix confidence is shown beside every established platform claim.

Not established

No supported platform claim is established for this prefix

The resolver answered successfully but returned no row above the evidence floor. This does not mean the vehicle has no platform or that no data exists; it means this store cannot make the claim.

Federal observation (NHTSA vPIC)

What the federal corpus observed directly for this exact VIN — independent of, and sometimes more specific than, the prefix-level inference above.

Observed model year
2028

Observed directly for this VIN via NHTSA vPIC.

Observed make
TRAILBOSS

Observed directly for this VIN via NHTSA vPIC.

Observed model
Trailboss Trailer

Observed directly for this VIN via NHTSA vPIC.

Observed body class
Trailer

Observed directly for this VIN via NHTSA vPIC.

Observed vehicle type
TRAILER

Observed directly for this VIN via NHTSA vPIC.

GVWR
Not established

Observed directly for this VIN via NHTSA vPIC.

Not established

  • platform make
  • platform model
  • model line
  • generation
  • cab type

These are withheld claims, not negative findings.

02

Inspection history

Every roadside inspection of this VIN, newest first · Aug 4, 2023 – Jun 7, 2025

DateStateLevelViol.OOSCarrier (DOT)Plate
Jun 7, 2025ALII · Walk-around9OOSALABAMA GRADING AND EXCAVATION LLC 217401131AA7DC/AL
Jan 29, 2025ALII · Walk-around4ALABAMA GRADING AND EXCAVATION LLC 217401131AA7DC/AL
Oct 30, 2024ALII · Walk-around2ALABAMA GRADING AND EXCAVATION LLC 217401131AA7DC/AL
Aug 4, 2023ALII · Walk-around5OOSALABAMA GRADING AND EXCAVATION LLC 217401131AA7DC/AL
03

Carriers this unit has run under

1 distinct carrier · grouped by DOT · newest activity first

CarrierDOTFirst seenLast seenInsp.State
ALABAMA GRADING AND EXCAVATION LLC2174011Aug 4, 2023Jun 7, 20254AL
Names are left-joined from the FMCSA census; a DOT with no census match falls back to its number.
04

Plate & unit-number history

The same truck under different plate registrations across carriers

PlateState / prov.Unit no.CarrierDate rangeInsp.
31AA7DCALALABAMA GRADING AND EXCAVATION LLCAug 4, 2023Jun 7, 20254
Sources: FMCSA SAFER · L&I · NHTSA vPIC · decoded Jul 14, 2026