G4 TANK LINES LLC
DENVER, CO
01/18/2023
56
Power Units
55
Drivers
Current
as of today
Active · 56 power units · 55 drivers · Denver, CO
2026
Apr 16, 2026
MCS-150 biennial update filed
Reported mileage: 1,871,200 (2025)
Reported power units: 82 → 56
Reported drivers: 55
Reported trailers: 67
Apr 2, 2026
MCS-150 biennial update filed
Reported mileage: 1,871,200 (2025)
Reported power units: 56 → 82
Reported drivers: 55
Reported trailers: 67
Mar 24, 2026
MCS-150 biennial update filed
Reported mileage: 1,871,200 (2025)
Reported power units: 82 → 56
Reported drivers: 55
Reported trailers: 67
Mar 23, 2026
MCS-150 biennial update filed
Reported mileage: 1,871,200 (2024)
Reported power units: 30 → 82
Reported drivers: 35 → 55
Reported trailers: 67
2025
~Dec 2025
Officer change
GUILLERMO GROSSI-ROFFI, BOB LAUMANN → GUILLERMO GROSSI-ROFFI
~Dec 2025
Phone changed
3039311625 → 7202108794
~Dec 2025
Email changed
blaumann@g4tanklines.com → ggrossi@g4tanklines.com
~Dec 2025
Officer change
THOMAS MOUNTS, BOB LAUMANN → GUILLERMO GROSSI-ROFFI, BOB LAUMANN
Dec 18, 2025
MCS-150 biennial update filed
Reported mileage: 150,000 (2024)
Reported power units: 30
Reported drivers: 35
Dec 12, 2025
MCS-150 biennial update filed
Reported mileage: 150,000 (2024)
Reported power units: 30
Reported drivers: 29 → 35
~Oct 2025
Phone changed
(208) 123-4567 → 3039311625
~Oct 2025
Driver count changed 29 → 35
May 5, 2025
MCS-150 biennial update filed
Reported mileage: 150,000 (2024)
Reported power units: 29 → 30
Reported drivers: 28 → 29
Feb 24, 2025
MCS-150 biennial update filed
Reported mileage: 392,647 (2024)
Reported power units: 9 → 29
Reported drivers: 6 → 28
2024
~Nov 2024
Email changed
kgrossi@g4tanklines.com → blaumann@g4tanklines.com
May 3, 2024
MCS-150 biennial update filed
Reported mileage: 10,000 (2023)
Reported power units: 5 → 9
Reported drivers: 5 → 6
~Mar 2024
Address changed
610 S LIPAN ST, DENVER, CO 80223 → 610 SOUTH LIPAN STREET, DENVER, CO 80223
~Mar 2024
Email changed
kiefer@g4energy.com → kgrossi@g4tanklines.com
Jan 24, 2024
MCS-150 biennial update filed
Reported mileage: 50,795 (2023)
Reported power units: 3 → 5
Reported drivers: 3 → 5
2023
Jan 18, 2023
DOT registered
Company registered with the FMCSA.
Jan 18, 2023
MCS-150 biennial update filed
Reported power units: 3
Reported drivers: 3