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
Diamond 4S Services LLC is an interstate motor carrier in Carthage, Texas (USDOT 4336911) with no for-hire authority on file (typical for private/intrastate carriers) and a self-reported fleet of 1 power unit.
Key takeaways
USDOT 4336911 is registered to Diamond 4S Services LLC, an interstate carrier based in Carthage, TX.
No FMCSA operating authority on file. Interstate for-hire carriers need it; private carriers and intrastate-only carriers generally do not.
Self-reported fleet size: 1 power unit and 1 driver (FMCSA MCS-150 self-report; sanitized for plausibility).
2 of 2Vehicle inspections with an out-of-service orderToo few inspections for a meaningful rate
2 of 2Driver inspections with an out-of-service orderToo few inspections for a meaningful rate
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 Diamond 4S Services LLC
Diamond 4S Services LLC is an interstate motor carrier based in Carthage, Texas, registered with the FMCSA under USDOT 4336911. It has no for-hire operating authority on file, which is typical for a private or intrastate carrier. The carrier self-reports a fleet of 1 power unit and 1 driver. Registered cargo includes general freight.
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.