Trailer inspection checklist for pre-hook checks

Key finding: on a power only load, the pre-hook walk-around is the only record of the trailer's condition before it became your responsibility. Five minutes of photos at the hook is cheaper than any damage bill.

This trailer inspection checklist is built for power only drivers: people who hook trailers owned by a broker, shipper or trailer pool and have never seen them before. It covers what federal rules require you to check, what interchange agreements make you pay for, and the photo routine that settles disputes. Print it, keep it in the cab, or download the spreadsheet version for your drivers.

The pre-hook checklist (printable)

PRE-HOOK SHEET / 29 CHECKS

Trailer inspection checklist

Print the checklistDownload CSV

Trailer #

Seal #

Date / time

Location

Paperwork and identity

01 / Paperwork and identity

• Trailer number. Matches the rate con, load tender or bill of lading
• Seal number (loaded trailers). Seal intact and the number matches the bill of lading. Write it down[Rate con / shipper rules]
• Plate and registration. Plate present, registration current
• Annual inspection proof. Sticker, decal or report shows an inspection within the last 12 months[49 CFR 396.17(c)]
• Prior damage notes. Any damage report or interchange form from the trailer owner matches what you see

Coupling

02 / Coupling

• Kingpin and upper plate. Kingpin straight and not worn; upper plate not cracked or bent[49 CFR 392.7]
• Fifth wheel locked. No gap between plates, jaws closed around the kingpin, release handle in. Tug test twice[49 CFR 392.7]
• Landing gear. Cranks both ways, legs and pads not bent, handle stowed before you roll
• Gladhands and air lines. Seals present, no hiss once connected, lines not chafed or kinked[49 CFR 392.7]
• Light cord (7-way). Plug seats firmly, pins not corroded, cord not cut

Brakes

03 / Brakes

• Trailer brakes apply and release. Brakes set when you pull the trailer supply valve and release when you push it[49 CFR 392.7]
• Air leaks. Walk the trailer with air built up and listen at chambers and lines
• Chambers and slack adjusters. Visible parts not broken, missing or hanging; pushrods look even side to side

Tires, wheels and rims

04 / Tires, wheels and rims

• Tread depth. At least 2/32 inch in a major groove on trailer tires[49 CFR 393.75(c)]
• Sidewalls and air. No exposed cord, separation, flat or audible leak[49 CFR 393.75(a)]
• Lug nuts and rims. No missing or loose lugs, no rust streaks from lug holes, no cracked rims
• Mud flaps. Present and secure (state rules vary)

Lights and conspicuity

05 / Lights and conspicuity

• Brake, turn, tail, marker and clearance lamps. Every lamp works. Have someone watch, or use a remote checker[49 CFR 392.7]
• Conspicuity tape. Red and white retroreflective tape present on the sides and rear, not peeled away
• Rear impact guard. Present, not bent or hanging loose

Body, doors and frame

06 / Body, doors and frame

• Doors and latches. Doors close and latch; hinges and lock rods intact
• Roof and walls. No holes or tears. On an empty, step inside with the doors closed and look for daylight
• Floor (empties). No broken boards or holes a forklift will go through
• Sliding tandem lock pins. All pins fully engaged; slider lock handle locked[49 CFR 392.7(b)]
• Rails and frame. No cracks, missing crossmembers or heavy damage underneath

Photos before you leave the yard

07 / Photos before you leave the yard

• Four corners and both sides. Wide shots that show the whole trailer and its number
• Every existing defect, close up. Dents, holes, tire damage, broken lamps, with something for scale
• Seal and trailer number. Clear close-ups, before you pull out
• Send them. Text or email the photos to the broker, program or dispatcher before you roll. Keep the timestamps

poweronlydispatch.com/guides/pre-hook-trailer-inspection. General information, not legal advice. Your program, broker or interchange agreement may require more.

The rule column points to the federal regulation behind a check where one exists. Checks without a rule are there because they are what trailer owners bill carriers for.

Why this matters more on power only

When you own the trailer, a missed defect costs you a repair. When you pull someone else's, it can cost you a repair at their shop rate plus downtime charges, and you have little say in either.

Three things make the hook the moment that counts:

• The interchange agreement shifts the risk to you. Most trailer interchange agreements make the carrier responsible for physical damage while the trailer is in its care, custody or control. That is why programs and equipment providers require trailer interchange coverage. IANA's UIIA requirements, for example, describe it as covering physical damage to non-owned equipment in the carrier's care, custody or control. Our power only insurance guide explains the coverage.
• The rule presumes you checked. Under 49 CFR 392.7(b), a driver who takes intermodal equipment over the road is presumed to have confirmed that the listed components were in good condition when the equipment was accepted. Pool trailers outside intermodal work are treated the same way in practice by most agreements: once you roll, the trailer is yours to explain.
• Nobody else is watching. At a drop and hook yard there is often no one at the trailer when you arrive. Your photos are the only evidence of what it looked like.

What the federal rules require

You don't need a special power only rule to be on the hook for the trailer. The general ones already apply.

General information, not legal or insurance advice. Check the cited source and your own advisor before you act.

Truck inspection checklist vs pre-hook check

A full truck inspection checklist for your daily pre-trip covers the tractor too: engine compartment, steering, cab, your own fifth wheel and air system. You already run that every day. This sheet covers only the trailer, because on power only it changes every load while your tractor doesn't.

In practice most drivers do the tractor pre-trip at the start of the shift and the trailer check at each hook. If you log a single inspection on your electronic logging device, make sure the time includes the trailer walk-around; a 2-minute on-duty block for a 53-foot trailer you have never seen does not look like an inspection to anyone reviewing it later.

How to run the check in 10 minutes

1. Paperwork first, at the nose. Read the trailer number and plate, find the annual inspection sticker, and match the number to your load. If it is the wrong trailer, you just saved yourself the whole job.
2. Back the tractor under, but don't hook yet. Look at the kingpin and upper plate from the side before the fifth wheel covers them.
3. Hook, lock and tug. Look for a gap between the plates, check the jaws with a flashlight, tug test twice.
4. Connect air and lights, build air. Then walk the trailer and listen for leaks while you check the lamps.
5. Walk the full circle. Tires, wheels, lugs, mud flaps, conspicuity tape, rear impact guard, doors, seal, tandem pins.
6. Take the photos before the landing gear goes up. If something is wrong, you are still parked and nothing is disputed yet.
7. Send the photos. To the broker, the program app or your dispatcher. A timestamped message is better than photos sitting in your phone.

What to do when a trailer fails

Don't hook it and hope. Call first:

• Small defects (one marker lamp out, a missing mud flap): ask the trailer owner whether to fix it and bill them, take it to their shop, or swap trailers. Get the answer in writing.
• Out-of-service defects (a flat, exposed cord, brakes that won't release, cracked kingpin plate, no annual inspection proof): don't move it. Ask for another trailer or a road service call on their account.
• Seal problems: a broken or mismatched seal on a loaded trailer goes to the shipper and broker before you leave. Don't apply your own seal unless they tell you to and write down both numbers.

If the swap takes hours, it is a detention or TONU question. Our guide to power only detention and trailer wait time covers how to document it.

Tow away and load out moves

Empty and new trailers need the same check, with a few changes. New trailers from a manufacturer may come with temporary plates or transport papers instead of a registration, and empties are your chance to check the floor and roof from inside. Loaded trailers on a load out need the seal check and an eye on the tandem position for weight. The differences between those moves are in tow away vs load out.

Method and update schedule

We built this checklist from the federal rules cited below, read on their official pages in October 2026. The component list follows 49 CFR 392.7 and the intermodal list in 392.7(b) and 396.11(b), applied to any trailer you don't own, plus the paperwork, body and photo checks that decide who pays when damage is found later. The rule column is checked against eCFR at each update.

We review this page once a year and whenever a cited rule changes. The next scheduled review is October 2027. If you spot an error, the editorial policy explains how to tell us.

If you would rather spend your time driving than chasing brokers about pool trailers, that is exactly what our power only dispatchers do: find the loads, book them, and handle the calls when a trailer at the yard isn't what was promised.