STACK BROS MECHANICAL CONTRACTORS INC
DBA: STACK BROS
Book with caution — review signals below
No hard OOS / revoked / uninsured blocker, but elevated risk signals need a human look before booking.
- OOS rate worse than size peers Driver and/or vehicle out-of-service rate is above the peer median.
Plain-text risk summary (print / paste)
TruckCodex risk summary — STACK BROS MECHANICAL CONTRACTORS INC (USDOT 1280175) Verdict: CAUTION Book with caution — review signals below No hard OOS / revoked / uninsured blocker, but elevated risk signals need a human look before booking. Authority / census status: Active Active BIPD limit: $750,000 Officer(s): WILLIAM E STACK (Company officer) Blockers: (none) Cautions: • OOS rate worse than size peers — Driver and/or vehicle out-of-service rate is above the peer median. On file: • 1 active operating authority • Insurance on file · $750,000 — TRAVELERS INDEMNITY COMPANY · 91X • BOC-3 process agent on file — TRUCKER & BROKER SERVICES INC Source: https://truckcodex.com/usdot/1280175/ As of: Jul 18, 2026 Always confirm on FMCSA SAFER and L&I before tendering — TruckCodex mirrors public filings and can lag by up to a day.
TruckCodex · compliance grade
Compliance grade B
Composite of 4/5 scored components (mean 79/100). Expand for per-signal evidence. Heuristic — not an FMCSA rating or legal advice.
B
confidence 80% · 4/5 signals
Compliance grade B
Composite of 4/5 scored components (mean 79/100). Expand for per-signal evidence. Heuristic — not an FMCSA rating or legal advice.
Active census status with no OOS order or revoked authority on file.
Active BIPD/Primary-like policy on file in our insurance history.
Driver OOS 11.1% vs peer median 1.5% (worse). Vehicle OOS 50% vs peer median 18.3% (worse). n=7052 same-size ACTIVE peers.
FMCSA has not assigned this carrier a formal safety rating. We do not invent one.
NR reason: No published FMCSA safety_rating.
No BMC-91 insurance-lapse watch classification on file for this USDOT.
TruckCodex compliance grade from authority, BIPD, peer OOS, FMCSA safety rating, and insurance-watch signals. Not legal advice. See methodology. Booking triage on this page: Caution.
Company profile
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InsuranceTRAVELERS INDEMNITY COMPANYPolicy effective Sep 27, 2023
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Process AgentTRUCKER & BROKER SERVICES INCBOC-3 on file
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Operating AuthorityMC1583591ACTIVE
Fleet details (MCS-150)
| Vehicle type | Owned | Term leased | Trip leased |
|---|---|---|---|
| Truck tractors | 5 | 0 | 0 |
| Trailers | 35 | 0 | 0 |
| Trucks | 129 | 0 | 0 |
Self-reported on the carrier’s Form MCS-150 (FMCSA Company Census).
Inspections (24 months)
All 25 inspections →| Driver | Vehicle | Hazmat | |
|---|---|---|---|
| Inspections | 7 | 7 | 0 |
| OOS inspections | 1 | 2 | 0 |
| OOS percentage | 14.29% | 28.57% | — |
| National average | 6.67% | 22.26% | 4.44% |
Roadside inspections in the last 24 months. National averages are FMCSA MCSAP reference rates (driver ~6.7%, vehicle ~23.4%, hazmat ~4.4%).
Carrier analysis & narrative context SEO summary, status notes, AI overview, and safety profiles
STACK BROS MECHANICAL CONTRACTORS INC is a motor carrier based in SUPERIOR, WI, registered with the FMCSA under USDOT 1280175. The carrier is currently active in FMCSA's records, and has not yet received a formal FMCSA safety rating. MCS-150 self-reporting puts the fleet at 134 power units and 143 drivers, with 25 roadside inspections on file and a peak out-of-service rate of 50.0%. Use this page to verify the carrier's authority and insurance, review its inspection and crash history, and cross-reference live data on FMCSA SAFER before booking a load or onboarding a partner.
Carrier is unrated
FMCSA has not assigned this carrier a formal safety rating. Use the inspection history and BASIC scores below to assess on-road performance.
STACK BROS MECHANICAL CONTRACTORS INC is a large fleet, operating 134 power units and 143 drivers, based in Superior, WI. Across 9 roadside inspections in the last 24 months, the fleet recorded a 44.4% out-of-service rate, with no reportable crashes on file. Operating authority is active for common.
9 roadside inspections over the last 24 months, down 36% versus the prior 24 months, concentrated in WI (4) and MN (4), with Level 3 inspections the most common.
44.4% out-of-service rate; led by Vehicle Maintenance (80.0% of violations); top code 393.45B2-B-AIR (Brake tubing/hoses inadequate) cited 2 times.
The fleet comprises 134 power units (large fleet) and 143 drivers; Freightliner, Ford, and Peterbilt are the most-inspected makes.
Risk Signals
Out-of-Service rate vs same-size peers FMCSA roadside inspections, % placed out-of-service
Compared against 7,052 ACTIVE carriers operating 67–201 power units (±50% of this carrier's 134 unit fleet).
Inspection Analytics Monthly activity · BASIC mix · state map
Monthly Inspection Activity (24 months)
Violations by BASIC Category
Vehicle Fleet Top makes and models observed in roadside inspections
| Make | Model | Inspections |
|---|---|---|
| Freightliner | 8 | |
| Ford | 6 | |
| Strg | 2 | |
| Towr | 2 | |
| International | 2 | |
| Benson Tru | 1 | |
| Landoll Co | 1 | |
| Oth | 1 |
SMS BASIC Scores FMCSA Safety Measurement System per-BASIC scores
| BASIC | Inspections | Serious | Measure | Percentile | Alert | As Of |
|---|---|---|---|---|---|---|
| Driver Fitness | 1 | — | 0.44 | 0 | — | Jul 13, 2026 |
| Controlled Substances / Alcohol | 0 | — | 0.00 | 0 | — | Jul 13, 2026 |
| Hours of Service | 1 | — | 0.27 | 0 | — | Jul 13, 2026 |
| Unsafe Driving | 2 | — | 0.15 | 0 | — | Jul 13, 2026 |
| Vehicle Maintenance | 7 | — | 10.40 | 10 | — | Jul 13, 2026 |
Higher percentiles indicate worse performance relative to peer carriers. Carriers at or above the FMCSA intervention threshold are marked ALERT.
Recent Inspections (25 rows) View all 25 →
| Inspection # | Date ▼ | State | Level | Station | Vehicle | Violations | Top Codes | OOS |
|---|---|---|---|---|---|---|---|---|
| 87911649 | May 20, 2026 | WI | 1 | — |
FREIGHTLINER TRUCK TRACTOR
|
0 | — | No |
| 87665108 | Apr 21, 2026 | WI | 1 | SOUTH RANGE WI |
FREIGHTLINER STRAIGHT TRUCK
|
1 | 5B-L | No |
| 86429025 | Nov 25, 2025 | WI | 1 | SOUTH RANGE WI |
FREIGHTLINER TRUCK TRACTOR
|
5 | 393.75A3-TAOL, 396.3A1-BOS, 393.48A-BIBD | Yes |
| 85344949 | Jul 22, 2025 | MN | 3 | LAKE CITY MN |
FORD STRAIGHT TRUCK
|
2 | 391.11B4, 392.2-SLLS3 | Yes |
| 84676153 | May 12, 2025 | WI | 1 | SOUTH RANGE WI |
STERLING TRUCK STRAIGHT TRUCK
|
3 | 393.9A-LCL, 396.5B-L, 393.45B2-B-AIR | No |
| 84620731 | May 6, 2025 | WI | 1 | SOUTH RANGE WI |
FREIGHTLINER STRAIGHT TRUCK
|
1 | 393.45B2-B-AIR | No |
| 84437215 | Apr 15, 2025 | WI | 2 | SUPERIOR WI |
WESTERN STAR STRAIGHT TRUCK
|
3 | 393.75A3-TAOL, 393.55C2-B, 392.16-D | Yes |
| 82170626 | Jul 16, 2024 | MN | 3 | TWO HARBORS MN |
PETERBILT TRUCK TRACTOR
|
0 | — | No |
| 82072633 | Jul 8, 2024 | IA | 2 | ia-39---i35-sb-mm-212-northwood |
FORD STRAIGHT TRUCK
|
5 | 393.43(d), 396.3(a)(1), 393.110(b) | Yes |
| 81733301 | May 23, 2024 | MN | 2 | CLOQUET MN |
FREIGHTLINER STRAIGHT TRUCK
|
1 | 393.95(a)(4) | No |
| 81624465 | May 10, 2024 | MN | 3 | CLOQUET MN |
FREIGHTLINER TRUCK TRACTOR
|
0 | — | No |
| 80731018 | Jan 31, 2024 | MN | 2 | SAGINAW WEIGH SCALE |
FREIGHTLINER TRUCK TRACTOR
|
7 | 392.2, 396.17(c), 393.55(d)(3) | No |
| 80720072 | Jan 30, 2024 | MN | 3 | CARLTON |
FORD STRAIGHT TRUCK
|
0 | — | No |
| 80522078 | Dec 28, 2023 | WI | 1 | SOUTH RANGE WI |
FORD STRAIGHT TRUCK
|
1 | 396.17C-PI | No |
| 80365511 | Dec 11, 2023 | WI | 1 | SOUTH RANGE WI |
INTERNATIONAL STRAIGHT TRUCK
|
2 | 393.9A-LCL, 393.45B2-B | No |
| 79875302 | Oct 6, 2023 | WI | 2 | wi-superior-(city) |
FREIGHTLINER STRAIGHT TRUCK
|
1 | 392.16(a) | No |
| 79620283 | Sep 7, 2023 | WI | 2 | SUPERIOR SWEF |
INTERNATIONAL STRAIGHT TRUCK
|
2 | 392.2 | No |
| 79547109 | Aug 29, 2023 | WI | 2 | SUPERIOR SWEF |
FORD STRAIGHT TRUCK
|
0 | — | No |
| 79459445 | Aug 18, 2023 | WI | 1 | wi-superior-(town) |
STERLING TRUCK STRAIGHT TRUCK
Ticket: Strg
|
3 | 393.53(b), 392.16(a), 393.47(e) | No |
| 79435254 | Aug 16, 2023 | WI | 3 | — |
STERLING TRUCK STRAIGHT TRUCK
Ticket: Strg
|
1 | 392.2 | No |
| 79283863 | Jul 29, 2023 | WI | 3 | wi-superior-(city) |
FORD STRAIGHT TRUCK
|
1 | 392.2 | No |
| 79245728 | Jul 25, 2023 | WI | 1 | SUPERIOR SWEF |
PETERBILT STRAIGHT TRUCK
|
3 | 392.2, 393.55(e) | No |
| 78719654 | May 23, 2023 | WI | 1 | SUPERIOR SWEF |
STERLING TRUCK STRAIGHT TRUCK
Ticket: Strg
|
5 | 396.3(a)(1), 393.48(a), 393.207(a) | Yes |
| 78649025 | May 16, 2023 | WI | 2 | STH 13 |
CHEVROLET STRAIGHT TRUCK
|
2 | 393.75(a)(3), 393.11 | Yes |
| 78648892 | May 16, 2023 | WI | 1 | SUPERIOR SWEF |
INTERNATIONAL STRAIGHT TRUCK
|
0 | — | No |
Recent Crashes (1 row)
| Report # | Date ▼ | State | Fatalities | Injuries | Tow | Hazmat | Severity |
|---|---|---|---|---|---|---|---|
| MN0151070177 | Apr 15, 2015 | MN | 0 | 0 | Yes | No | Tow |
Authority Records (1 docket)
MC Certificate Documents (1 PDF)
Authority Records (above) are FMCSA docket status and lifecycle events. MC Certificate Documents here are the archived PDF letters for each action — grants, reinstatements, revocations, name changes, and transfers. They are related but not the same dataset: one row per PDF letter, not one file per docket.
Click a row to open that specific letter. Multiple letters per docket are listed separately by action type and date.
| Date | Docket | Action | Authority | |
|---|---|---|---|---|
| Oct 12, 2023 | MC1583591-C | CPL | REVOCATION | CPL → |
Insurance Coverage Timeline (1 row)
Every insurance policy on file, newest effective date first. Amber rows mark BIPD/Primary coverage gaps.
| Insurer | Policy # | Type | Limit | Effective | Cancel | Status |
|---|---|---|---|---|---|---|
| TRAVELERS INDEMNITY COMPANY | 3L209924 | 91X | $750,000 | Sep 27, 2023 | On file | ACTIVE |
Compliance Timeline Merged authority / insurance / enforcement events
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Oct 12, 2023
Top Stations & Violation Codes Where this carrier gets inspected and what they get cited for
Most-Inspected Stations
| Station | State | Inspections | OOS |
|---|---|---|---|
| SOUTH RANGE WI | WI | 6 | 1 |
| SUPERIOR SWEF | WI | 5 | 1 |
| CLOQUET MN | MN | 2 | 0 |
| CARLTON | MN | 1 | 0 |
| LAKE CITY MN | MN | 1 | 1 |
| SAGINAW WEIGH SCALE | MN | 1 | 0 |
| TWO HARBORS MN | MN | 1 | 0 |
| STH 13 | WI | 1 | 1 |
| SUPERIOR WI | WI | 1 | 1 |
Top Violation Codes Cited
| Code | Description | Category | Cited | OOS |
|---|---|---|---|---|
| 392.2 | Violation of Local Laws - Explain: | Unsafe Driving | 9 | 0 |
| 393.48(a) | Inoperative/defective brakes | Vehicle Maintenance | 4 | 0 |
| 392.16(a) | Failing to use seat belt (49 CFR) | Unsafe Driving | 2 | 0 |
| 396.3(a)(1) | Inspection, repair and maintenance of parts and accessories | Vehicle Maintenance | 2 | 2 |
| 393.11 | No or defective lighting devices or reflective material as required | Vehicle Maintenance | 1 | 0 |
| 393.110(b) | Insufficient tiedowns to prevent forward movement for load not blocked by headerboard, bulkhead, or other cargo. | Vehicle Maintenance | 1 | 1 |
| 393.207(a) | Axle positioning parts defective/missing | Vehicle Maintenance | 1 | 0 |
| 393.43(d) | No or defective automatic trailer brake | Vehicle Maintenance | 1 | 1 |
| 393.47(e) | Brake Out of Adjustment - Roto, Clamp (Short & Long), DD-3, or Bolt | Vehicle Maintenance | 1 | 0 |
| 393.53(b) | CMV manufactured after 10/19/94 has an automatic airbrake adjustment system that fails to compensate for wear | Vehicle Maintenance | 1 | 0 |
Related Records Cross-references to every adjacent page
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Wisconsin carriers
All carriers based in Wisconsin
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Superior carriers
Carriers based in Superior, WI
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Stations in Wisconsin
Where this carrier might be inspected
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Docket MC1583591
common · ACTIVE · MC
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TRAVELERS INDEMNITY COMPANY
91X policy on file
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TRUCKER & BROKER SERVICES INC
BOC-3 process agent · 55,281 carriers served
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25 inspections
Full roadside inspection history
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1 reportable crash
FMCSA MCMIS crash log
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Fleet recall search
NHTSA recalls covering this fleet's vehicle years/makes
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File a complaint
Open the FMCSA National Consumer Complaint form for this carrier
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Carrier comparison tool
Side-by-side vs. other carriers
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Certificate lookup
Look up any FMCSA authority by MC/MX/FF docket number
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All state carrier directories
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Insurance-lapse watch
Carriers with recent BMC-91 cancellation or reinstatement churn
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How FMCSA safety ratings work
BASIC percentiles and compliance review context
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BOC-3 process agents explained
Why every interstate carrier must file a process agent
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FMCSA compliance filings guide
MCS-150, insurance, and authority filing requirements
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Roadside inspection rights
What drivers and carriers can expect during a stop
How to verify STACK BROS MECHANICAL CONTRACTORS INC
- Verify USDOT and MC numbers match the carrier's documents. Compare the USDOT number and MC docket on this page to the numbers on the carrier's invoice, rate confirmation, or load-board listing. A mismatch between the carrier's claimed numbers and the registered legal name is the single most common red flag.
- Check active operating authority and insurance status. Confirm the Authority Records show at least one ACTIVE docket for the type of operation you're booking, and that the Active Insurance card lists a current BIPD/Primary policy. A revoked authority or uninsured carrier cannot legally operate.
- Review safety rating and SMS BASIC scores. Check the carrier's FMCSA safety rating (if any) and the SMS BASIC table. A high percentile in any BASIC category — especially Unsafe Driving, HOS, or Vehicle Maintenance — is worth investigating before tendering a load.
- Examine inspection and crash history. Open the Inspection History and Crash History subpages for the full record. Look for patterns: repeat OOS findings on the same unit, multiple crashes in a short window, or violations clustered in one BASIC category.
- Cross-reference real-time data with FMCSA SAFER. For the most current snapshot — within 24 hours of any insurer filing or authority change — click through to the FMCSA SAFER lookup. TruckCodex mirrors SAFER and L&I daily; SAFER itself reflects filings within 24 hours.
Frequently asked questions about STACK BROS MECHANICAL CONTRACTORS INC
Is STACK BROS MECHANICAL CONTRACTORS INC an active motor carrier? ▾
What is STACK BROS MECHANICAL CONTRACTORS INC's safety rating? ▾
How many inspections has STACK BROS MECHANICAL CONTRACTORS INC had? ▾
What is STACK BROS MECHANICAL CONTRACTORS INC's out-of-service rate? ▾
Where is STACK BROS MECHANICAL CONTRACTORS INC based? ▾
Does STACK BROS MECHANICAL CONTRACTORS INC have valid operating authority? ▾
How many trucks and drivers does STACK BROS MECHANICAL CONTRACTORS INC operate? ▾
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About FMCSA carrier records
Every commercial motor carrier operating in the United States is required to register with the Federal Motor Carrier Safety Administration (FMCSA) and obtain a USDOT number. The USDOT number is a permanent, unique identifier — once assigned, it stays with the carrier for life and is never reissued to another company. Carriers must update their registration every two years on Form MCS-150 to keep their address, fleet size, and operating data current.
Carrier safety data lives in FMCSA's Motor Carrier Management Information System (MCMIS): roadside inspections, crashes, out-of-service findings, and the seven Behavior Analysis and Safety Improvement Categories (BASICs) that make up the SMS scoring methodology. For-hire carriers must also hold operating authority — an MC, FF, or MX docket number — which is separate from the USDOT number and requires continuous insurance and BOC-3 process-agent filings to remain active.
TruckCodex mirrors FMCSA's public SAFER and L&I systems on a daily refresh cycle. Every record on this page reflects what FMCSA has on file. We do not edit or modify carrier data — for real-time confirmation immediately before a transaction, click through to the FMCSA SAFER lookup linked in the related records section above. Safety ratings, when present, come from formal compliance reviews; most active carriers have not been reviewed and are correctly listed as unrated.
Data sources & freshness
TruckCodex aggregates official public-sector datasets. See the Source registry for dataset-level coverage and the Freshness log for last-import timestamps.
Census, SAFER, SMS, Licensing & Insurance (L&I), roadside inspections, crashes, and authority history.
Vehicle recall campaigns, defect investigations, and consumer safety complaints (SCRS).
Cross-border carrier registry and Canadian recall campaigns where applicable.
TruckCodex is an independent aggregator; it is not affiliated with FMCSA, NHTSA, EIA, or Transport Canada. Always verify compliance-critical information directly with the originating agency.