Equipment unit · VIN-decoded · NHTSA vPIC

1999 Peterbilt 378

1XPFDB9X9XD473505 · Truck-Tractor · TRUCK
Carriers run under2
19 mo
Inspections5
all-time
OOS inspections1
of 5
First seenOct 13, 2023
WA
Last seenMay 15, 2025
OR
Inspected under 2 different carriers in 19 months
A unit that bounces between many operators can indicate slip-seating, heavy sub-haul, or double-brokering. Review the carrier timeline below for load integrity — context for human judgment, not a verdict.
01

Decoded identity

From the 17-character VIN via NHTSA vPIC

VIN
1XPFDB9X9XD473505
Make
Peterbilt
Model
378
Model year
1999
Body class
Truck-Tractor
Vehicle type
TRUCK
GVWR
Class 8: 33,001 lb and above (14,969 kg and above)
Decoded at
Jun 29, 2026
vPIC returns make / model / year / body class / GVWR. Fields it does not resolve are shown as Not decoded rather than guessed.
02

Inspection history

Every roadside inspection of this VIN, newest first · Oct 13, 2023 – May 15, 2025

DateStateLevelViol.OOSCarrier (DOT)Plate
May 15, 2025ORII · Walk-around1OOSMIDDLE MOUNTAIN TRUCKING LLC 2567099YAKM127/OR
Oct 4, 2024WAIII · Driver-only0—WILLIAMSON BULK TRANSPORT LLC 3129485D44609E/WA
Mar 26, 2024WAIII · Driver-only0—WILLIAMSON BULK TRANSPORT LLC 3129485D44609E/WA
Mar 18, 2024WAIII · Driver-only0—WILLIAMSON BULK TRANSPORT LLC 3129485D44609E/WA
Oct 13, 2023WAIII · Driver-only0—WILLIAMSON BULK TRANSPORT LLC 3129485C69633X/WA
03

Carriers this unit has run under

2 distinct carriers · grouped by DOT · newest activity first

CarrierDOTFirst seenLast seenInsp.State
MIDDLE MOUNTAIN TRUCKING LLC2567099May 15, 2025May 15, 20251OR
WILLIAMSON BULK TRANSPORT LLC3129485Oct 13, 2023Oct 4, 20244WA
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.
YAKM127OR—MIDDLE MOUNTAIN TRUCKING LLCMay 15, 2025 → May 15, 20251
D44609EWA—WILLIAMSON BULK TRANSPORT LLCMar 18, 2024 → Oct 4, 20243
C69633XWA—WILLIAMSON BULK TRANSPORT LLCOct 13, 2023 → Oct 13, 20231
Sources: FMCSA SAFER · L&I · NHTSA vPIC · decoded Jun 29, 2026