Equipment unit · VIN-decoded · NHTSA vPIC

2023 Peterbilt 579

1XPBDP9X4PD811940 · Truck-Tractor · TRUCK

Carriers run under3

30 mo

Inspections4

all-time

OOS inspections0

of 4

First seen08/22/2023

Last seen02/18/2026

Inspected under 3 different carriers in 30 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.

Decoded identity

From the 17-character VIN via NHTSA vPIC

VIN: 1XPBDP9X4PD811940
Make: Peterbilt
Model: 579
Model year: 2023
Body class: Truck-Tractor
Vehicle type: TRUCK
GVWR: Class 8: 33,001 lb and above (14,969 kg and above)
Decoded at: 07/12/2026

vPIC returns make / model / year / body class / GVWR. Fields it does not resolve are shown as Not decoded rather than guessed.

Inspection history

Every roadside inspection of this VIN, newest first · 08/22/2023 – 02/18/2026

Date	State	Level	Viol.	OOS	Carrier (DOT)	Plate
02/18/2026	TN	III · Driver-only	0	—	CONWAY COURIER SERVICE INC 906238	K833641/AR
02/16/2026	MI	III · Driver-only	1	—	CONWAY COURIER SERVICE INC 906238	K833641/AR
09/21/2023	AL	II · Walk-around	2	—	PINNACLE EXPRESS LLC 2361789	K822484/AR
08/22/2023	PA	III · Driver-only	1	—	T BERRY AUTO TRANSPORT INC 299722	K822484/AR

Carriers this unit has run under

3 distinct carriers · grouped by DOT · newest activity first

Carrier	DOT	First seen	Last seen	Insp.	State
CONWAY COURIER SERVICE INC	906238	02/16/2026	02/18/2026	2	AR
PINNACLE EXPRESS LLC	2361789	09/21/2023	09/21/2023	1	AR
T BERRY AUTO TRANSPORT INC	299722	08/22/2023	08/22/2023	1	PA

Names are left-joined from the FMCSA census; a DOT with no census match falls back to its number.

Plate & unit-number history

The same truck under different plate registrations across carriers

Plate	State / prov.	Unit no.	Carrier	Date range	Insp.
K833641	AR	—	CONWAY COURIER SERVICE INC	02/16/2026 → 02/18/2026	2
K822484	AR	—	PINNACLE EXPRESS LLC	09/21/2023 → 09/21/2023	1
K822484	AR	—	T BERRY AUTO TRANSPORT INC	08/22/2023 → 08/22/2023	1

Sources: FMCSA SAFER · L&I · NHTSA vPIC · decoded 07/12/2026