DBA: Stack Bros
Stack Bros Mechanical Contractors Inc is an active interstate carrier based in Superior, WI.
No insurance filings on record.
View on FMCSA L&I| Vehicle Type | Owned | Term Leased | Trip Leased |
|---|---|---|---|
| Straight Trucks | 129 | 0 | 0 |
| Tractors | 5 | 0 | 0 |
| Trailers | 35 | 0 | 0 |
| Total Power Units | 134 | ||
Distinct vehicles · 24 mo
vs 134 self-reported (MCS-150)
Top makes
Registered in
Higher values = more violations. 0 = clean record.
| Category |
|---|
| Category | vs. Cohort | vs. State | Reading |
|---|---|---|---|
| Unsafe Driving | 29% | 91% | Better than most peers |
| HOS Compliance | 94% | 98% | Worse than most peers |
| Driver Fitness | 86% | 97% | Worse than most peers |
| Controlled Substances | 0% | 0% | Better than most peers |
| Vehicle Maintenance | 100% | 96% | 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 | 1 | — | 6.67% |
| Vehicle | 0 | 3 | — | 22.26% |
| Hazmat | 0 | 0 | — | 4.44% |
| Period | Fatalities | Injuries | Tow-away | Total |
|---|---|---|---|---|
| No crashes recorded | 0 | 0 | 0 | 0 |
Most-cited violation codes
| BASIC Category | Total | Severe | OOS |
|---|---|---|---|
| Vehicle Maintenance | 15 |
| Date | State | Vehicle | Violations | OOS |
|---|---|---|---|---|
| Nov 25, 2025 | WI | TRUCK TRACTOR | 4 | 2 |
| Jul 22, 2025 | MN | STRAIGHT TRUCK | 2 | 1 |
| May 12, 2025 | WI | STRAIGHT TRUCK | 3 | 0 |
| May 6, 2025 | WI | STRAIGHT TRUCK | 1 |
| Insp w/ Viol |
|---|
| Measure |
|---|
| Alert |
|---|
| Unsafe Driving | 2 | 0.20 | — |
| HOS Compliance | 1 | 0.33 | — |
| Vehicle Maintenance | 6 | 12.09 | — |
| Driver Fitness | 1 | 0.53 | — |
| Controlled Substances | 0 | 0.00 | — |
Where they run
Inspected in 3 states. Top state MN accounts for 44% of activity. Activity outside home state (WI): 56%.
| 6 |
| Unsafe Driving | 2 | 2 | 0 |
| Driver Fitness | 1 | 0 | 1 |
| Hours-of-Service Compliance | 1 | 0 | 0 |
| 0 |
| Apr 15, 2025 | WI | STRAIGHT TRUCK | 3 | 1 |
| Jul 16, 2024 | MN | TRUCK TRACTOR | 0 | 0 |
| Jul 8, 2024 | IA | STRAIGHT TRUCK | 5 | 3 |
| May 23, 2024 | MN | STRAIGHT TRUCK | 1 | 0 |
| May 10, 2024 | MN | TRUCK TRACTOR | 0 | 0 |
| Date | Code | Description | BASIC | OOS |
|---|---|---|---|---|
| Nov 25, 2025 | 39348ABIBD | Drum Brake - Inoperative other than a steering axle | Vehicle Maintenance | — |
| Nov 25, 2025 | 39348ABLMACBD | Drum Brake - Loose chamber/spider/camshaft support bracket | Vehicle Maintenance | — |
| Nov 25, 2025 | 39375A3TAOL | Tires - All others leaking or inflation less than 50% of the maximum inflation pressure on tire not equipped with ATIS | Vehicle Maintenance | Yes |
| Nov 25, 2025 | 3963A1BOS | Brake - Defective brake(s) are equal to or greater than 20% of the service brakes on the vehicle/combination | Vehicle Maintenance | Yes |
| Jul 22, 2025 | 39111B4 | Medical (Certificate) - Operating a CDL (passenger or property carrying) vehicle that is non-excepted and the driver has self-certified as excepted interstate or | Driver Fitness | Yes |
| Jul 22, 2025 | 3922SLLS3 | State/Local Laws - Speeding 11-14 miles per hour over the speed limit | Unsafe Driving | — |
| May 12, 2025 | 39345B2BAIR | Air Brake - Hose/tubing damaged or not secured | Vehicle Maintenance | — |
| May 12, 2025 | 3939ALCL | Lighting - Clearance lamp(s) inoperative | Vehicle Maintenance | — |
| May 12, 2025 | 3965BL | Lubrication - Oil or grease leak | Vehicle Maintenance | — |
| May 6, 2025 | 39345B2BAIR | Air Brake - Hose/tubing damaged or not secured | Vehicle Maintenance | — |