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Truck Graph
0/100
✗ Do Not Tender
No active for-hire authority. Cannot legally haul freight for hire.
Robs Masonry
DOT 3504839 · MC FF42421 · Canton, MA
Report generated: June 8, 2026 at 12:38 PM
✗Authorized for hire?
✗Active insurance?
✓Safety record clean?
✓No fraud flags?
✓No prior revocations?
Carrier Summary

Robs Masonry (DOT 3504839, MC FF42421) is a Massachusetts-based intrastate carrier headquartered in Canton, MA. As of June 8, 2026 at 12:38 PM, operating authority is active but without for-hire authority. TruckGraph has detected 1 risk signal on this carrier, including: no active insurance filing on record. TruckGraph rates this carrier "Do Not Tender" based on FMCSA compliance data, inspection history, insurance status, and network connection analysis. Last synced: June 8, 2026 at 12:38 PM.

FMCSA Public Record
Robert Knauber
Operating as: Robs Masonry
DOT Number3504839
MC NumberFF42421
Street292 WALPOLE ST
City / StateCanton, MA 02021
Phone7818289028
Operation typeIntrastate
HazmatNot authorized
Authority age5 yr 7 mo
MCS-150 filed10/29/2020
Company officerRobert Arthur Knauber Sr
Power units1
Total drivers1
Authority Status
Common (for-hire)—
Contract (for-hire)—
Broker—
TruckGraph Intelligence
Risk Signals
●No active insurance filing on record
✓ OFAC Sanctions: Clear
Connection Chain
DOT nullShared insurer
Revoked
Network Intelligence Map
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Power Units
1
Fleet
Drivers
1
Total
Inspections
0
On record
Crashes
0
On record
OOS Rate
—
↓ Avg 22.26%
Authority Age
5 yr 7 mo
Since 2020
Inspection History
0 total · No inspections

No inspection records on file.

Crash History
0 total on record

No crash records on file.

Insurance Status
⚠ No active insurance filing on record
Verify insurance directly with carrier before tendering any load.
Location
292 WALPOLE ST, Canton, MA, 02021 · Open in Maps →
292 WALPOLE ST, CANTON, MA, 02021Open in Maps →
Authority Timeline
Authority GrantedOct 2020
FMCSA issued operating authority
Active USDOT — No for-hire authorityCurrent
USDOT record is active but no for-hire operating authority is currently granted

Source: FMCSA compliance records, inspection data, crash records, insurance filings, and TruckGraph analysis. View methodology

Important Legal Notice

Data sourced from FMCSA public records and TruckGraph independent analysis. This is not legal advice, not a guarantee of carrier safety, and not a compliance certification. Verify through official FMCSA sources before tendering. Last synced: .

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Frequently Asked Questions

Is Robert Knauber authorized to operate?

Robert Knauber's USDOT number is active but it does not hold operating authority for for-hire interstate operations. It may operate as a private carrier. Verify status before tendering.

What is Robert Knauber's safety record?

Robert Knauber does not have a substantial inspection history on record. This may indicate limited interstate operations.

How many trucks does Robert Knauber operate?

Robert Knauber operates 1 power units with approximately 1 drivers.

Is Robert Knauber insured?

Insurance filing details are not available in the current dataset. Verify directly with the carrier before tendering.

Has Robert Knauber had any risk indicators?

Robert Knauber has a risk score of 0/100 (Monitor) with 1 active risk signal. Review the risk section above and verify independently before tendering.

What is the DOT number for Robert Knauber?

Robert Knauber's DOT number is 3504839 and MC number is FF42421. These identifiers are assigned by the FMCSA and can be used to look up this carrier in official compliance databases.

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Truck Graph data is open and citable. For press inquiries, contact our editorial team.

APA
Truck Graph. (2026). Robs Masonry Safety Record, DOT 3504839. Retrieved from https://truckgraph.com/carriers/3504839
MLA
"Robs Masonry Safety Record, DOT 3504839." Truck Graph, Jun 8, 2026, https://truckgraph.com/carriers/3504839
Chicago
"Robs Masonry Safety Record, DOT 3504839." Truck Graph. Last modified June 8, 2026. https://truckgraph.com/carriers/3504839