Rex Lee Siemer Trucking Llc is an active interstate carrier based in Mercer, MO.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 17 | 0 | 0 |
| Tractors | 17 | 0 | 0 |
| Trailers | 20 | 0 | 0 |
| Total Power Units | 17 | ||
Distinct vehicles · 24 mo
vs 17 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 92% | 94% | Worse than most peers |
| HOS Compliance | 87% | 94% | Worse than most peers |
| Driver Fitness | 90% | 96% | Worse than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 82% | 90% | Worse than most peers |
Lower percentile = lower SMS measure = stronger safety record. Computed nightly across active carriers in the same state and fleet-size band.
| Type | Inspections | OOS | OOS % | Nat'l Avg |
|---|---|---|---|---|
| Driver | 0 | 3 | — | 6.67% |
| Vehicle | 0 | 1 | — | 22.26% |
| Hazmat | 0 | 0 | — |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| Jan 1, 2026 | 0 | 0 | 1 | 1 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 8 | 1 | 1 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Mar 23, 2026 | IA | TRUCK TRACTOR | 1 | 0 |
| Mar 6, 2026 | WI | TRUCK TRACTOR | 3 | 2 |
| Mar 2, 2026 | MO | TRUCK TRACTOR | 0 | 0 |
| Feb 16, 2026 | WI | TRUCK TRACTOR | 5 | 0 |
| Insp w/ Viol |
|---|
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 4 | 3.11 | — |
| HOS Compliance | 2 | 0.81 | — |
| Vehicle Maintenance | 4 | 8.37 | — |
| Driver Fitness | 2 | 1.56 | — |
| Controlled Substances | 0 | 0.00 | — |
| 4.44% |
Where they run
Inspected in 5 states. Top state IA accounts for 47% of activity. Activity outside home state (MO): 87%.
| Unsafe Driving |
| 4 |
| 1 |
| 0 |
| Driver Fitness | 2 | 2 | 2 |
| Hours-of-Service Compliance | 2 | 0 | 1 |
| Nov 13, 2025 |
| KS |
| TRUCK TRACTOR |
| 1 |
| 0 |
| Nov 11, 2025 | WI | TRUCK TRACTOR | 1 | 0 |
| Nov 4, 2025 | IL | TRUCK TRACTOR | 0 | 0 |
| Oct 28, 2025 | IA | TRUCK TRACTOR | 0 | 0 |
| Jul 17, 2025 | IA | TRUCK TRACTOR | 1 | 1 |
| Jan 28, 2025 | IA | TRUCK TRACTOR | 0 | 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Mar 23, 2026 | 3922SLLS3 | State/Local Laws - Speeding 11-14 miles per hour over the speed limit | Unsafe Driving | — |
| Mar 6, 2026 | 38323A2LCDLN | License (CDL) - Operate a CMV and does not possess a valid CDL | Driver Fitness | Yes |
| Mar 6, 2026 | 3922SLLS2 | State/Local Laws - Speeding 6-10 miles per hour over the speed limit | Unsafe Driving | — |
| Mar 6, 2026 | 3958A1HOSP | HOS (Property) - Failing to have a record of duty status using the method prescribed | Hours-of-Service Compliance | Yes |
| Feb 16, 2026 | 39311BCSSRR | Conspicuity Systems - Trailers side retro reflective sheeting inadequate on vehicle manufactured on or after December 1 1993 | Vehicle Maintenance | — |
| Feb 16, 2026 | 39355C2B | Air Brake - CMV other than truck-tractor manufactured on or after March 1 1998 not equipped with an antilock brake system. System does not function or indicates | Vehicle Maintenance | — |
| Feb 16, 2026 | 39355D1B | Air Brake - ABS malfunction lamp defective on truck-tractor manufactured on or after March 1 1997 and each single unit CMV on or after 1998. | Vehicle Maintenance | — |
| Feb 16, 2026 | 39378 | Wipers - Inoperative / missing / damaged wipers | Vehicle Maintenance | — |
| Feb 16, 2026 | 3939ALRLI | Lighting - Tail lamp - Any inoperative | Vehicle Maintenance | — |
| Nov 13, 2025 | 3939ALLPL | Lighting - License plate lamp inoperative | Vehicle Maintenance | — |