VIN 4KNBF2121LL160711 — 2020 TOWM TL Monroe Towmaster
Recorded with Serra Stone Corporation · USDOT 577700
Vehicle identity
| VIN | 4KNBF2121LL160711 |
| Model year | 2020 |
| Make | TOWM TL |
| Model | Monroe Towmaster |
| Vehicle type | OTHER |
| License plate | MD 279260X (Maryland) |
| Inspection window | 2025-07-16 to 2025-11-13 |
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 |
|---|---|---|---|
| 2025-11-13 | 4KNBF2121LL160711 | MD 279260X | SERRA STONE CORPORATION · USDOT 577700 |
Evidence: FMCSA inspection observations and retained snapshots of our vehicle records. Coverage is incomplete; an unreported change cannot be dated from these records.
Most recently recorded carrier for this vehicle
Serra Stone Corporation Active
- USDOT
- 577700
- MC
- —
- Status
- Active
- Type
- Motor Carrier
- Based in
- Bethesda, MD
- Power units
- 8
- Drivers
- 9
- Inspections (24 mo)
- 13
- Crashes (24 mo)
- 0
- Vehicle OOS rate
- 36.4%
Carrier recorded at the latest inspection in the available records (2025-11-13). 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.What this means
4KNBF2121LL160711 is a 2020 TOWM TL Monroe Towmaster operated by Serra Stone Corporation (USDOT 577700). License plate on its inspection records: MD 279260X. 3 roadside inspections on FMCSA record. No out-of-service violations are recorded for this VIN in the available inspection records. Other violations may still be present.
What this VIN is
2020 TOWM TL Monroe Towmaster is the vehicle NHTSA’s VIN registry returns for 4KNBF2121LL160711. It is a trailer built by MONROE TOWMASTER, LLC at the LITCHFIELD, MINNESOTA plant. Powertrain: running on not applicable, paired with a not applicable transmission.
Roadside inspection & out-of-service record
This specific vehicle appears in 3 FMCSA roadside inspections between 2025-07-16 and 2025-11-13. Across those inspections it was never placed out of service. Its most recent inspection (2025-11-13) was in Virginia, a Level II — walk-around inspection of the driver and the vehicle. No violations were recorded against this vehicle in our inspection window.
Operator history
Operated by Serra Stone Corporation (USDOT 577700) from 2025-07-16 to 2025-11-13 — 3 inspections, none out of service.
Full spec sheet (NHTSA vPIC decode)
| Make | MONROE TOWMASTER |
| Model | Monroe Towmaster |
| Model Year | 2020 |
| Vehicle Type | TRAILER NHTSA’s top-level vehicle category derived from the VIN. |
| Body Class | Trailer The body style NHTSA assigns from the VIN — e.g. truck-tractor, straight truck, or cutaway. |
| Manufacturer | MONROE TOWMASTER, LLC The legal manufacturer of record in NHTSA’s database. |
| Plant City | LITCHFIELD Where the chassis was assembled — useful for verifying the VIN against the build record. |
| Plant State | MINNESOTA |
| Plant Country | UNITED STATES (USA) |
| Axles | 2 Number of axles — ties directly to weight limits and toll/registration class. |
Operator & inspection history
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Frequently Asked Questions
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