Equipment unit · VIN-decoded · NHTSA vPIC

2018 Mertz manufacturing Mertz Manufacturing, LLC

1M91H4320JA211970 · Trailer · TRAILER
Carriers run under3
25 mo
Inspections3
all-time
OOS inspections1
of 3
First seenApr 23, 2024
TX
Last seenMay 13, 2026
TX
Inspected under 3 different carriers in 25 months
A unit that bounces between many operators can indicate slip-seating, heavy sub-haul, or double-brokering. Review the carrier timeline below for load integrity — context for human judgment, not a verdict.
01

Decoded identity

From the 17-character VIN via NHTSA vPIC

VIN
1M91H4320JA211970
Make
Mertz manufacturing
Model
Mertz Manufacturing, LLC
Model year
2018
Body class
Trailer
Vehicle type
TRAILER
GVWR
Not decoded
Decoded at
Jul 25, 2026
vPIC returns make / model / year / body class / GVWR. Fields it does not resolve are shown as Not decoded rather than guessed.
02

Inspection history

Every roadside inspection of this VIN, newest first · Apr 23, 2024 – May 13, 2026

DateStateLevelViol.OOSCarrier (DOT)Plate
May 13, 2026TXI · Full3OOSHEART OF GOLD TRANSPORT LLC 4295539AJ9458/OK
Oct 10, 2025TXII · Walk-around1—JOEL DIAZ XPRESS LLC 3848130AJ9458/OK
Apr 23, 2024TXI · Full6—RIG TRANSPORTATION GROUP LLC 4019934AJ9458/OK
03

Carriers this unit has run under

3 distinct carriers · grouped by DOT · newest activity first

CarrierDOTFirst seenLast seenInsp.State
HEART OF GOLD TRANSPORT LLC4295539May 13, 2026May 13, 20261TX
JOEL DIAZ XPRESS LLC3848130Oct 10, 2025Oct 10, 20251TX
RIG TRANSPORTATION GROUP LLC4019934Apr 23, 2024Apr 23, 20241TX
Names are left-joined from the FMCSA census; a DOT with no census match falls back to its number.
04

Plate & unit-number history

The same truck under different plate registrations across carriers

PlateState / prov.Unit no.CarrierDate rangeInsp.
AJ9458OK—HEART OF GOLD TRANSPORT LLCMay 13, 2026 → May 13, 20261
AJ9458OK—JOEL DIAZ XPRESS LLCOct 10, 2025 → Oct 10, 20251
AJ9458OK—RIG TRANSPORTATION GROUP LLCApr 23, 2024 → Apr 23, 20241
Sources: FMCSA SAFER · L&I · NHTSA vPIC · decoded Jul 25, 2026