License Plate OK 3NK038 (Oklahoma) — Iron Guardian Llc
USDOT 4537901 · 2021 Peterbilt 579
Recorded vehicle, plate and carrier history
These are dated observations in the records available to us. They do not establish ownership, a sale, a transfer date, or continuous use between observations. The latest observation may not describe today’s vehicle or carrier.
| Observed dates | VIN | Plate | Reported carrier |
|---|---|---|---|
| 2026-06-21 | 1XPBDP9X4MD735129 | OK 3NK038 | IRON GUARDIAN LLC · USDOT 4537901 |
| 2026-01-06 | 1XPBDP9X4MD735129 | OK 3NK038 | JEFFERY A CAMPBELL · USDOT 745118 |
Evidence: FMCSA inspection observations and retained snapshots of our vehicle records. Coverage is incomplete; an unreported change cannot be dated from these records.
Later observations of these vehicles
- Vehicle identifier 1XPBDP9X4MD735129 was recorded with OK 558C89 on 2026-09-25.
Most recently recorded carrier for this plate
Iron Guardian Llc Active
- USDOT
- 4537901
- MC
- 1800328
- Status
- Active
- Type
- Motor Carrier
- Based in
- Guthrie, OK
- Power units
- 2
- Drivers
- 2
- Inspections (24 mo)
- 2
- Crashes (24 mo)
- 0
- Vehicle OOS rate
- 0%
Carrier recorded at the latest inspection in the available records (2026-06-21). This does not establish current ownership or confirm that the carrier still operates this vehicle.
View full carrier profile →Authority, insurance & bonds, safety scores, crash history, inspections and the full fleet list.This plate has also been operated by 1 other carrier (listed below).
What this means
License plate OK-3NK038 appears in FMCSA inspection records 3 times. Recorded on one vehicle: VIN 1XPBDP9X4MD735129 (2021 Peterbilt 579). Operated by 2 different carriers (DOT numbers) over its inspection history. Most recent operating carrier: Iron Guardian Llc (USDOT 4537901). Vehicle make on file: Peterbilt (PTRB) (TRUCK TRACTOR). No out-of-service violations are recorded under this plate in the available inspection records. Other violations may still be present.
About this plate
Commercial license plate OK-3NK038 (Oklahoma) appears in FMCSA roadside inspection records tied to one commercial vehicle. Inspection activity under this plate runs from 2026-01-06 to 2026-06-21. The latest inspection was in Iowa, a Level III — driver and paperwork only. That is outside the plate's issuing jurisdiction (Oklahoma).
Vehicle on this plate
This plate is associated with a single vehicle, a 2021 Peterbilt 579 — VIN 1XPBDP9X4MD735129 (truck tractor).
Combined inspection & out-of-service record
Across all vehicles on this plate there are 3 inspections on FMCSA record. No out-of-service violations appear in the available records under this plate. This does not mean that every inspection was free of other violations. The leading violation category is Unsafe Driving (1). Unsafe Driving covers speeding, improper lane changes and other moving violations.
Operators
2 carriers have operated vehicles under this plate (most recent first): Iron Guardian Llc (USDOT 4537901) from 2026-04-09 to 2026-06-21; Jeffery A Campbell (USDOT 745118) on 2026-01-06.
Vehicle detail (inspections per unit)
FMCSA BASIC safety category breakdown
| BASIC Category | Violations | Status |
|---|---|---|
| Unsafe Driving | 1 | — Minor |
| Vehicle Maintenance | 0 | ✓ Clean |
| Driver Fitness | 0 | ✓ Clean |
| Fatigued Driving (HOS) | 0 | ✓ Clean |
| Controlled Substances | 0 | ✓ Clean |
| Hazmat | 0 | ✓ Clean |