Fleet typeIdentity
Asset-based
134 power units. Brokers price each fleet type apart.
Carrier profile · USDOT 1280175 · MC-1583591
STACK BROS MECHANICAL CONTRACTORS INC
DBA STACK BROS
134 power unitsavg 14.5 yrLocal · 2 statesSUPERIOR, WI
CARRIER ACTIVEMC-1583591 ACTIVEHAZMAT
Observed fleet · trailing 24 mo daily
134Power units
7 observed · MCS-150
3Trailers seen
Decoded · vPIC
14.5Avg age (yr)
1998–2020 · vPIC
Click to see how we scored it
Load decision · FMCSA snapshot · 2026-06-13
Review before loading
Operating, but with flags a broker should weigh before tendering freight.
Active operating authorityInsurance on fileVehicle out-of-service rate well above average
Watch · 2
Operating authority2121 yr active
since 2004Insurance (BIPD)On file
FMCSA L&IVehicle OOS · 24mo42.942.9 %
▲ 22.26% nat'lCrashes · fatal00
clean 24 moVektor intelligence · beyond the federal recordProprietary signals computed from VIN-decoded inspections & daily FMCSA snapshots
Fleet age vs peersOlder
14.5 yr
Model years 1998–2020 · peer benchmark computing.
Identity stabilityStable
21 yr unchanged
Same registration since 2004 — no chameleon / reincarnation signal.
AI readFull read
Is STACK BROS MECHANICAL CONTRACTORS INC safe to work with?
Is STACK BROS MECHANICAL CONTRACTORS INC safe to load? STACK BROS MECHANICAL CONTRACTORS INC (USDOT 1280175, MC-1583591) is an active asset-based motor carrier based in SUPERIOR, WI, operating 134 power units and 143 drivers. Operating authority has been active 21 years (past the 24-month broker-confidence threshold). Across 23 roadside inspections, its vehicle out-of-service rate is 42.9% (above the 22.26% national average), with 0 reportable crashes in the last 24 months. FMCSA has not assigned a safety rating. Vektor rates it review before loading (80/100), with the leading concern: vehicle out-of-service rate well above average. Source: FMCSA SAFER/MCMIS, last updated 2026-06-13.
FMCSA fields + Vektor analysis · updated 2026-06-13
SBSTACK BROS MECHANICAL CONTRACTORS INC 80
01
Safety
23 inspections · 24 mo · vs national benchmarks
Out-of-service rate· trailing 24 months vs national benchmark
Vehicle OOS 42.9% (24-mo)7 veh insp · 24-mo · nat'l 22.26%
050%nat'l 22.26%
Driver OOS 12.5% (24-mo)8 drv insp · 24-mo · nat'l 6.67%
030%nat'l 6.67%
OOS trajectory· trailing 6-mo vehicle-OOS rate vs national
50.0% now▲ Worsening
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.
Under-inspected
Expected
Well-monitored
Heavily inspected
≈0.0 / unit·yr
thin signalabundant signal
Few roadside inspections for a 134-unit fleet — the out-of-service and violation signals above rest on a small sample, so weight them cautiously. Thin coverage on a young authority is itself a flag.
- Registered power units
- 134
- Inspections · 24 mo
- 8
- Annualized
- ≈4 / yr
- Coverage
- ≈0.0 inspections / unit · yr
Violation themes· decoded · grouped by BASIC
What this carrier actually gets cited for — FMCSA violation codes decoded into plain English, ranked by frequency.
- 392.2 State/local traffic law violation (speeding, etc.)Unsafe Driving11
- 393.9 Inoperative required lampsVehicle Maintenance7 · 1 OOS
- 393.48 Brakes inoperativeVehicle Maintenance4
- 392.16 Failure to use seat beltUnsafe Driving3
- 393.45 Brake tubing / hose defectsVehicle Maintenance3
- 393.75 Tires (defective / underinflated / worn)Vehicle Maintenance3 · 2 OOS
- 393.55 Antilock brake system (ABS)Vehicle Maintenance3
- 396.5 Oil and/or grease leakVehicle Maintenance2
- 393.95 Emergency equipment (extinguisher, triangles)Vehicle Maintenance2
- 396.17 Periodic (annual) inspectionVehicle Maintenance2
02
Authority & insurance
Can they legally + adequately haul your load?
Operating authority· 49 CFR · per type
Operating authority
- Common
- Active
- Contract
- None
- Broker
- None
Insurance & bonds
BIPD / liability (required)Filed with FMCSA
CargoNone
Surety bond (BMC-84)None
Insurance continuity· insurer · policy · lapses
No insurance filing history on record.
03
Equipment & fleet
VIN-decoded · NHTSA vPIC
Capacity· power units = haulable capacity; trailers are towed
- Registered power units (MCS-150)
- 134
- Observed power (24 mo)
- 7
- Trailers (towed)
- 3
Capacity is power units only — trailers are towed equipment and are never summed into a fleet-size figure.
Fleet age· model years · decoded VINs
Average age
2020
Newest model yr
1998
Oldest model yr
VINs decoded
04
Operations & lanes
Revealed by inspection density across 2 states · 24 mo
Operating footprint· revealed by roadside-inspection geography
Operating radiusLocal
revealedStates observed22
US statesInspections · 24 mo88
WI busiestInspection density by state· each tile = a state · shade = inspections, last 24 mo
Home base
SUPERIOR, WI
Top corridor
WI
Density
fewermore
05
Network & fraud
Affiliated entities & reincarnation signals · for review, not a verdict
No shared-VIN flow in the last 12 months
None of this carrier's trucks were inspected under another USDOT in the last 12 months — any shared equipment is historical, not active.
Show all-time history (1 truck · 1 carriers)
Across all inspections on record: USDOT 3332145
Capacity consistency· registered vs roadside-observed power units
Registered (MCS-150)134134
Observed (24 mo)77
Shared w/ other carriers11
Registered capacity materially exceeds what is observed roadside — the MCS-150 may be stale or the fleet under-utilized.
06
Identity & contact
FMCSA census + L&I dossier
Location
- Physical address
- 3119 HILL AVE, SUPERIOR, WI, 54880
- Operation
- Interstate· Hazmat
Contact
- Phone
- (715) 398-2964
- Cell
- (218) 348-2455
- Fax
- (715) 398-2967
- bill@stackbr.com
- Web domain
- stackbr.com
Registration
- Officer
- William E Stack
- USDOT / docket
- 1280175 · MC-1583591
- First registered
- 08/27/2004
- Last MCS-150
- 05/27/2025 · 600,000 mi (2022)
- FMCSA safety rating
- Not rated
- Recordable crash rate
- 0.00
- D-U-N-S
- —
Fleet (self-reported · MCS-150)
07
Federal activity
Daily-captured FMCSA licensing & insurance changes — monitored by Vektor
Federal record activity· monitored daily by Vektor
No licensing or insurance changes captured since Vektor began monitoring this carrier (June 2026). Quiet is usually good.
08
Reviews
Verified broker, shipper & driver reviews — moderated
Performance ratings only — never the Vektor risk score
No verified reviews yet
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Leave a review09
Frequently asked
What is STACK BROS MECHANICAL CONTRACTORS INC's USDOT number?
STACK BROS MECHANICAL CONTRACTORS INC's USDOT number is 1280175, and its motor carrier number is MC-1583591.
Is STACK BROS MECHANICAL CONTRACTORS INC authorized to operate?
As of 2026-06-13, STACK BROS MECHANICAL CONTRACTORS INC is active in the FMCSA register with common, contract, broker operating authority on file.
What is STACK BROS MECHANICAL CONTRACTORS INC's safety record?
STACK BROS MECHANICAL CONTRACTORS INC has a 42.9% vehicle out-of-service rate (national average 22.26%) across 23 roadside inspections, with 0 reportable crashes in the last 24 months, and is not currently rated by FMCSA. Vektor's computed risk score is 80/100 (tier: review).
How big is STACK BROS MECHANICAL CONTRACTORS INC's fleet?
STACK BROS MECHANICAL CONTRACTORS INC operates 134 power units and 143 drivers per its most recent MCS-150 filing.
Where is STACK BROS MECHANICAL CONTRACTORS INC based?
STACK BROS MECHANICAL CONTRACTORS INC is based in SUPERIOR, WI, with roadside inspections recorded across 2 states.