Equipment unit · VIN-decoded · NHTSA vPIC

2021 Monroe Towmaster

4KNBF2324ML160765 · Trailer · TRAILER
Carriers run under1
26 mo
Inspections6
all-time
OOS inspections3
of 6
First seenApr 8, 2024
MD
Last seenJun 24, 2026
MD
01

Decoded identity

From the 17-character VIN via NHTSA vPIC

VIN
4KNBF2324ML160765
Make
Monroe Towmaster
Model
Monroe Towmaster
Model year
2021
Body class
Trailer
Vehicle type
TRAILER
GVWR
Not decoded
Decoded at
Jun 28, 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
4KN

Deterministic · VIN positions 1–3.

Vehicle descriptor section
BF232

Deterministic · VIN positions 4–8.

Check digit
4 · valid

Deterministic · position 9; calculated value 4.

Model year candidates
1991 or 2021

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

North American serial sequence
160765

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.

Make
MONROE TOWMASTER

Prefix basis · 10 decoded VINs at 100.0% prefix purity.

Model
Monroe Towmaster

Prefix basis · 10 decoded VINs at 100.0% prefix purity.

Model line
Not established

No sourced model-line label is established.

No source established for this field.

Generation
Not established

No sourced generation label is established.

No source established for this field.

Cab type
Not established

No sourced cab label is established.

No source established for this field.

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
2021

Observed directly for this VIN via NHTSA vPIC.

Observed make
MONROE TOWMASTER

Observed directly for this VIN via NHTSA vPIC.

Observed model
Monroe Towmaster

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

  • model line
  • generation
  • cab type

These are withheld claims, not negative findings.

02

Inspection history

Every roadside inspection of this VIN, newest first · Apr 8, 2024 – Jun 24, 2026

DateStateLevelViol.OOSCarrier (DOT)Plate
Jun 24, 2026MDII · Walk-around1OOSLEN THE PLUMBER 1094755231547X/MD
Nov 26, 2025MDIII · Driver-only2OOSLEN THE PLUMBER 1094755231547X/MD
Nov 7, 2024MDII · Walk-around2OOSLEN THE PLUMBER 1094755231547X/MD
Jun 18, 2024PAIII · Driver-only2LEN THE PLUMBER 1094755231547X/MD
Jun 6, 2024NJI · Full0LEN THE PLUMBER 1094755231547X/MD
Apr 8, 2024MDII · Walk-around0LEN THE PLUMBER 1094755231547X/MD
03

Carriers this unit has run under

1 distinct carrier · grouped by DOT · newest activity first

CarrierDOTFirst seenLast seenInsp.State
LEN THE PLUMBER1094755Apr 8, 2024Jun 24, 20266MD
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.
231547XMD2LEN THE PLUMBERApr 8, 2024Jun 24, 20266
Sources: FMCSA SAFER · L&I · NHTSA vPIC · decoded Jun 28, 2026