Carrier profile · USDOT 136742 · Updated Jun 13, 2026

C H Guenther & Son LLC

DBA PIONEER FLOUR MILLS

1 power unitLocal · 1 statesSAN ANTONIO, TX50/100
AUTHORITY STATUS UNKNOWN
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Safety

Roadside out-of-service rates versus the national benchmark, inspection and crash trends, decoded violation themes, and ELD / hours-of-service integrity — the full safety picture behind the verdict.

Out-of-service rate· 24-mo cumulative

Vehicle OOS 0.0%24-mo cumulative
050%
Driver OOS 0.0%24-mo cumulative
030%

Every inspection in the window pooled — 1 vehicle and 1 driver inspections over 24 months.

Roadside inspection history· 24 charted calendar months · vehicle / driver level · any-OOS overlay

No roadside inspections on the FMCSA record in this window

Inspection coverage· expected vs observed · the fraud signal

Inspection coverage

How heavily FMCSA inspects this fleet for its size — it tells you how much to trust the safety signals above. Thin coverage on a young authority is a fraud signal nobody else surfaces.

Expected band
Under-inspected
Expected
Well-monitored
Heavily inspected
≈0.5 / unit·yr
thin signalabundant signal
Roadside-inspection volume is about what you'd expect for a 1-unit fleet — enough signal to read the safety record, though not a heavy sample.
Registered power units
1
Inspections · 24 mo
1
Annualized
≈1 / yr
Coverage
≈0.5 inspections / unit · yr

BASIC categories· CSA SMS · Aug 2026

Unsafe Driving
0violations
clean · per-BASIC
Hours-of-Service
0violations
clean · per-BASIC
Driver Fitness
0violations
clean · per-BASIC
Controlled Substances
0violations
clean · per-BASIC
Vehicle Maintenance
6measure
SMS · per-BASIC

Percentile = standing among same-exposure peers (higher = worse). FMCSA publishes percentiles for only some carriers (shown official); elsewhere we show a Vektor peer-percentile estimate, or the absolute SMS measure when there are too few inspections to rank.

Violation themes· decoded · grouped by BASIC

What this carrier actually gets cited for — FMCSA violation codes decoded into plain English, ranked by frequency.

  • 390.21 USDOT number marking on vehicleUnsafe Driving1 · 0 OOS
  • 393.55 Antilock brake system (ABS)Vehicle Maintenance1 · 0 OOS
  • 393.9 Inoperative required lampsVehicle Maintenance1 · 0 OOS

ELD & hours-of-service

No hours-of-service or ELD violations on record across 1 inspections — a clean logging history.

Crash history· 11 total · 1 in 24 mo

11
Total crashes
1
In last 24 mo
0
Fatal
4
Injury
YearCrashesFatalInjuryTow
20251001
20191001
20131001
20071001
20062002
20033033
20021011
19971001
DateStateFatalitiesInjuriesTow-away
Apr 11, 2025TX00Yes
Jun 20, 2019TX00Yes
Nov 25, 2013TX00Yes
Feb 1, 2007MO00Yes
Sep 26, 2006TX00Yes
Feb 18, 2006TX00Yes
Apr 27, 2003TX02Yes
Mar 8, 2003TX01Yes
Mar 8, 2003TX01Yes
Sep 18, 2002KS01Yes
Jan 9, 1997IL00Yes