How often do trailers need to be inspected?
The federal rule, whose job it is, and what a warehouse checks at its own gate.
Reviewed October 2026
Short answer: at least once every 12 months. Under federal motor carrier rules, every commercial motor vehicle, including each trailer in a combination, must pass a periodic inspection within the preceding 12 months, and documentation of it has to be on the vehicle (49 CFR 396.17). On top of that, the driver must be satisfied the vehicle is in safe operating condition before driving it (49 CFR 396.13). Those are the carrier's obligations. A warehouse adds its own checks at the gate and the dock.
What the federal rule covers
| Rule | What it says | Who it's on |
|---|---|---|
| Periodic inspection 49 CFR 396.17 | Every commercial motor vehicle "must be inspected". Each listed component must have passed an inspection "at least once during the preceding 12 months", with documentation on the vehicle. Each vehicle in a combination counts: for a tractor-semitrailer, the tractor and the semitrailer are each inspected. | The motor carrier |
| Before driving 49 CFR 396.13 | The driver must "be satisfied that the motor vehicle is in safe operating condition" and review the last driver vehicle inspection report where one is required. | The driver |
This page summarizes the rules and links them. It isn't legal advice, and state rules or your contracts can add to them.
What the warehouse is responsible for
The annual inspection isn't the warehouse's job, but three checks on your own property are:
- What you accept at the gate. A walkaround and a record of the trailer's condition when it arrived, so a damage claim later is settled by the record, not by memory.
- Security inspections, if you're in a program. CTPAT members run a 17-point inspection on tractors and trailers, and CBP's job aid says it must be systematic and done at conveyance storage yards (CBP 17-point job aid, Oct 2021). Containers get the 7-point list; see the 7-point checklist guide.
- Safety before a forklift goes in. OSHA requires the trailer floor to be checked for breaks and weakness before it's driven onto, with brakes set and wheel blocks in place (29 CFR 1910.178(m)(7)).
Gate walkaround checklist
A practical list for the guard, not a regulatory one. Anything marked "no" gets a photo, a note, and a decision before the trailer goes to a door.
- Trailer number read off the unit, and it matches the paperwork.
- Seal present, intact, and its number matches the bill of lading.
- Doors, hinges, handles and locking bars intact, with no fresh damage.
- Tires, lights and mud flaps with no obvious damage.
- No visible damage to the walls, roof or undercarriage.
- For reefers, the unit running, and the set point matches the order.
- Time, photo and guard name on the record.
The gate check-in guide covers the rest of the record.
FAQ
Does the annual inspection apply to trailers as well as tractors?
Yes. The rule says each vehicle in a combination must be inspected: for a tractor-semitrailer, the tractor and the semitrailer are each inspected.
Is the warehouse responsible for trailer inspections?
The periodic inspection is the motor carrier's obligation. A warehouse is responsible for what happens on its own property: checking what it accepts at the gate, the security inspection if it is in a program such as CTPAT, and the safety steps before a forklift enters a trailer at the dock.
Put the walkaround on the record.
With Vantage, the guard logs gate in and out on a phone, with a timestamp on every record and a photo whenever the camera is used. The Free plan is $0 for 3 users, 1 yard and 100 gate transactions a month. No card. The digital C-TPAT 7-point container inspection is on the Pro plan.
Related: C-TPAT inspection app · digital gate log app · yard check sheet