License Plate CA 4WM9079 (California) — Bill Polkinhorn Incorporated
USDOT 506308 · 2022 Dodge Doonan Specialized Trailer
Most recently recorded carrier for this plate
Bill Polkinhorn Incorporated Active
- USDOT
- 506308
- MC
- 258822
- Status
- Active
- Type
- Motor Carrier
- Based in
- Calexico, CA
- Power units
- 12
- Drivers
- 12
- Inspections (24 mo)
- 228
- Crashes (24 mo)
- 0
- Vehicle OOS rate
- 15.8%
Carrier recorded at the latest inspection in the available records (2026-01-21). 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 CA-4WM9079 appears in FMCSA inspection records 2 times. Recorded on one vehicle: VIN 1D9BG4828N1609580 (2022 Dodge Doonan Specialized Trailer). Operated by 2 different carriers (DOT numbers) over its inspection history. Most recent operating carrier: Bill Polkinhorn Incorporated (USDOT 506308). Vehicle make on file: Dodge (DODG) (SCHOOL BUS). 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 CA-4WM9079 (California) appears in FMCSA roadside inspection records tied to one commercial vehicle. Inspection activity under this plate runs from 2025-08-13 to 2026-01-21. The latest inspection was in California, a Level I — full inspection of the driver and the vehicle.
Vehicle on this plate
This plate is associated with a single vehicle, a 2022 Dodge Doonan Specialized Trailer — VIN 1D9BG4828N1609580 (school bus).
Combined inspection & out-of-service record
Across all vehicles on this plate there are 2 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.
Operators
2 carriers have operated vehicles under this plate (most recent first): Bill Polkinhorn Incorporated (USDOT 506308) on 2026-01-21; Main Electric Supply Company Llc (USDOT 2741609) on 2025-08-13.