Sources: census record as of October 19, 2026; authority and insurance from FMCSA L&I, checked October 4, 2026; inspections and crashes from FMCSA SMS, checked October 4, 2026.
Quick answer
Warren Grant Thompson And William Grant Thompson is an interstate motor carrier in Cedar Hill, Texas (USDOT 3378156) with active operating authority and a self-reported fleet of 1 power unit.
Key takeaways
USDOT 3378156 is registered to Warren Grant Thompson And William Grant Thompson, an interstate carrier based in Cedar Hill, TX.
MC docket number on file: MC-1083825.
Operating authority status: authorized (Common), with $750K BIPD insurance on file.
Self-reported fleet size: 1 power unit and 1 driver (FMCSA MCS-150 self-report; sanitized for plausibility).
Registered cargo types include general freight, logs, poles, beams, building materials / construction, refrigerated food / meat.
Source: FMCSA Safety Measurement System, roadside inspections and crashes over a ~24-month window, checked October 4, 2026. An out-of-service rate is the share of inspections in which a vehicle or driver was placed out of service. With few inspections, one result moves the rate a lot. FMCSA crash records include crashes regardless of fault. None of these figures is a safety rating. The official Satisfactory/Conditional/Unsatisfactory safety rating is issued separately. See SAFER.
About Warren Grant Thompson And William Grant Thompson
Warren Grant Thompson And William Grant Thompson is an interstate motor carrier based in Cedar Hill, Texas, registered with the FMCSA under USDOT 3378156. It holds active operating authority (MC-1083825), with $750K of BIPD insurance on file. The carrier self-reports a fleet of 1 power unit and 1 driver. Registered cargo includes general freight, logs, poles, beams, building materials / construction, refrigerated food / meat. Its most recent MCS-150 filing reported 1 mi (2025).
Before you work with this carrier
Confirm the safety rating. Authority and insurance are shown or linked above. Open the SAFER snapshot for the official safety rating and out-of-service status.
Verify insurance is current. Coverage on file can lapse; confirm active BIPD/cargo before tendering a load.
Match authority to the work. For-hire loads need active operating authority. A USDOT number alone isn't enough.