DOTBrightInspect

Does each trailer need its own DOT annual inspection?

Yes. 49 CFR 396.17(a) defines each vehicle in a combination as a commercial motor vehicle. For a tractor, semitrailer and full trailer, the tractor, the semitrailer and the full trailer, including the converter dolly if equipped, must each be inspected, with proof on each unit.

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Book an inspection where your vehicle is parked. Same-day slots, a digital record within 60 minutes, and no shop day.

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Which units in a combination need an annual inspection?

The rule: annual inspections in a combination vehicle. Last reviewed: October 13, 2026.
UnitNeeds its own annual inspection?Source
Tractor or truckYes49 CFR 396.17(a)
SemitrailerYes49 CFR 396.17(a)
Full trailerYes49 CFR 396.17(a)
Converter dolly, if equippedYes49 CFR 396.17(a)
Proof of inspectionOn each unit49 CFR 396.17(c)

What does the trailer rule mean for you?

  1. 01

    List every unit.

    Write down each power unit, trailer and converter dolly you operate.

  2. 02

    Inspect each one.

    Each unit gets its own inspection and its own report.

  3. 03

    Put proof on each unit.

    Each trailer carries its own report or sticker, not the tractor's. Sticker rules.

  4. 04

    Track each date.

    Trailers inspected on different days expire on different days. How long it's good for.

  5. 05

    Keep each report 14 months.

    File reports by unit so you can produce them on demand. Record rules.

How are trailers priced with Bright Inspect?

Each trailer or converter dolly counts as its own unit. One unit is $99. Fleet discounts start at 2 units: $84.15 per unit for 2 to 3 units and $74.25 per unit for 4 to 7 units. For 8 or more units, ask for a custom fleet quote. See pricing.

Frequently asked questions

Yes. 396.17(a) names the converter dolly, if equipped, as a unit that must be inspected.

It can. A truck, trailer or combination rated 10,001 lb or more is a federal CMV under 49 CFR 390.5. If the combination qualifies, each unit needs its own inspection. Box trucks and hotshots.

Yes. Federal rules accept the inspection report itself, or a sticker or decal based on it, as proof on the vehicle (396.17(c)).

Need your annual inspection done?

Book an inspection where your vehicle is parked. Same-day slots, a digital record within 60 minutes, and no shop day.

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