Resource

California DOT & Safety Inspections: What You Need to Know

A quick guide to California DOT safety inspection requirements for heavy vehicles and special loads. Learn who needs an inspection and how to apply.

Published: August 2, 2025

Last updated:

September 30, 2025

California DOT & Safety Inspections

Please note that we do not currently perform DOT Reports at our Palo Alto location, but host this page as a courtesy to our customers.

If you operate heavy vehicles or specialized equipment in California, certain configurations require a DOT Vehicle Inspection Report before a transportation permit can be issued. Here’s a high-level overview of who this applies to—and where to find the details.

Source: CA Vehicle Inspection Report

Inspections Are Required For

Four-axle power units (for extralegal weight permits only)

Power units exceeding 20,000 lbs on the steering axle

Fixed-load vehicles, including cranes, self-propelled units, and trailer-mounted equipment

Heavy haul combinations routed as a “9-axle” or greater

Vehicles with mechanical distribution units (MDU)

Vehicle combinations with weight distribution or dimensional inconsistencies

Boat trailers requiring extralegal weight

Any change of ownership, configuration, or modification to the vehicle

Note: Inspection reports are required for all companies—including California-based and out-of-state—when applying for transportation permits.

How to Apply for Inspection Reports

The Californa DMV hosts complete correct inspections form for each vehicle type. Note that no scanned or handwritten copies accepted.

At Hengehold Trucks, our team helps businesses and fleet owners stay compliant with California safety requirements. We can guide you through inspections, paperwork, and preventive maintenance—so your trucks stay road-ready and your business keeps moving.

About Hengehold Trucks

Founded in 1948, Hengehold Trucks is Northern California’s most trusted source for pre-owned commercial vehicles, rentals, service, and professional upfitting. Family-owned and based in Palo Alto, we’ve built our reputation on trust, straightforward pricing, and the best-maintained fleet in the region. For over 75 years, contractors, businesses, and public agencies have relied on us to keep their operations moving—with work-ready trucks, expert service, and support you can count on.