Equipment unit · VIN-decoded · NHTSA vPIC

2026 Polar Tank Trailer

3H6KK442XT3178596 · Trailer · TRAILER
Carriers run under1
5 mo
Inspections3
all-time
OOS inspections0
of 3
First seenDec 3, 2025
CA
Last seenMay 15, 2026
NM
01

Decoded identity

From the 17-character VIN via NHTSA vPIC

VIN
3H6KK442XT3178596
Make
Polar Tank Trailer
Model
Polar Tank Trailer
Model year
2026
Body class
Trailer
Vehicle type
TRAILER
GVWR
Not decoded
Decoded at
Aug 5, 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
3H6

Deterministic · VIN positions 1–3.

Vehicle descriptor section
KK442

Deterministic · VIN positions 4–8.

Check digit
X · valid

Deterministic · position 9; calculated value X.

Model year candidates
1996 or 2026

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

North American serial sequence
178596

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
2026

Observed directly for this VIN via NHTSA vPIC.

Observed make
POLAR TANK TRAILER

Observed directly for this VIN via NHTSA vPIC.

Observed model
Polar Tank 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 · Dec 3, 2025 – May 15, 2026

DateStateLevelViol.OOSCarrier (DOT)Plate
May 15, 2026NMII · Walk-around0ECOLOGY CONTROL INDUSTRIES INC 197051003C725/TX
May 3, 2026CAII · Walk-around0ECOLOGY CONTROL INDUSTRIES INC 197051003C725/TX
Dec 3, 2025CAII · Walk-around1ECOLOGY CONTROL INDUSTRIES INC 197051003C725/TX
03

Carriers this unit has run under

1 distinct carrier · grouped by DOT · newest activity first

CarrierDOTFirst seenLast seenInsp.State
ECOLOGY CONTROL INDUSTRIES INC197051Dec 3, 2025May 15, 20263CA
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.
003C725TXECOLOGY CONTROL INDUSTRIES INCDec 3, 2025May 15, 20263
Sources: FMCSA SAFER · L&I · NHTSA vPIC · decoded Aug 5, 2026