Equipment unit · VIN-decoded · NHTSA vPIC

1988 Diamond C Trailer Mfg.

46UFU3524J1201252 · Trailer · TRAILER
Carriers run under1
31 mo
Inspections12
all-time
OOS inspections0
of 12
First seenAug 10, 2023
TN
Last seenMar 16, 2026
PA
01

Decoded identity

From the 17-character VIN via NHTSA vPIC

VIN
46UFU3524J1201252
Make
Diamond C Trailer Mfg.
Model
Diamond C Trailer Mfg.
Model year
1988
Body class
Trailer
Vehicle type
TRAILER
GVWR
Not decoded
Decoded at
Jun 16, 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
46U

Deterministic · VIN positions 1–3.

Vehicle descriptor section
FU352

Deterministic · VIN positions 4–8.

Check digit
4 · valid

Deterministic · position 9; calculated value 4.

Model year candidates
1988 or 2018

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

North American serial sequence
201252

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
ROADCLIPPER ENTERPRISES, INC.

Prefix basis · 57 decoded VINs at 98.3% prefix purity.

Model
Roadclipper Enterprises, Inc.

Prefix basis · 57 decoded VINs at 98.3% 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
1988

Observed directly for this VIN via NHTSA vPIC.

Observed make
DIAMOND C TRAILER MFG.

Observed directly for this VIN via NHTSA vPIC.

Observed model
Diamond C Trailer Mfg.

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 · Aug 10, 2023 – Mar 16, 2026

DateStateLevelViol.OOSCarrier (DOT)Plate
Mar 16, 2026PAIII · Driver-only4UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Dec 4, 2025PAI · Full0UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Sep 4, 2025OHII · Walk-around2UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
May 13, 2025PAI · Full1UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Sep 9, 2024OHI · Full0UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Apr 30, 2024PAI · Full0UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Feb 15, 2024OHIII · Driver-only0UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Jan 30, 2024NYI · Full0UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Jan 3, 2024OHII · Walk-around2UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Dec 21, 2023OHIII · Driver-only0UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Oct 24, 2023OHI · Full0UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
Aug 10, 2023TNI · Full0UNDERWOOD TRUCKING LTD 1862708TRW4857/OH
03

Carriers this unit has run under

1 distinct carrier · grouped by DOT · newest activity first

CarrierDOTFirst seenLast seenInsp.State
UNDERWOOD TRUCKING LTD1862708Aug 10, 2023Mar 16, 202612OH
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.
TRW4857OHUNDERWOOD TRUCKING LTDAug 10, 2023Mar 16, 202612
Sources: FMCSA SAFER · L&I · NHTSA vPIC · decoded Jun 16, 2026