Free DOT trailer inspection checklist
Free DOT trailer inspection checklist (PDF-ready). Covers FMCSA 49 CFR 396 coupling, brakes, lights, tyres, suspension, frame and cargo. Download free.
Updated 2 Oct 2026
DOT Trailer Inspection Checklist
Pre-trip and annual trailer inspection per FMCSA 49 CFR Part 396
Coupling Devices
Brakes
Lights and Reflectors
Tyres and Wheels
Suspension
Frame and Body
Cargo Securement
Inspector
Signature
Print name
Date & time
Carrier / Supervisor Acknowledgement
Signature
Print name
Date
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Short answer
A DOT trailer inspection checklist records the condition of a commercial trailer: coupling devices, brakes, lights and reflectors, tyres, suspension, frame, landing gear and cargo securement. Drivers use it before trips and carriers at periodic inspections. 49 CFR 396.17 requires each trailer to pass a periodic inspection of the Appendix A components at least every 12 months, by an inspector qualified under 396.19.
Checked against 49 CFR 396 (Current eCFR text, up to date as of 2026-10-22 (read 2026-10-26)) on by the MapTrack templates team. How we check templates
Key takeaways
- The MapTrack DOT trailer inspection checklist contains 25 checks across 7 sections. Sections covered: Coupling Devices, Brakes, Lights and Reflectors, Tyres and Wheels, Suspension, Frame and Body, Cargo Securement.
- Each trailer must pass a periodic inspection of the Appendix A components at least every 12 months, by an inspector qualified under 396.19.
- Before driving, the driver must be satisfied the trailer is safe and review the last inspection report, if one was required (396.13).
- Trailer tyres need at least 2/32 inch tread under 393.75, with no exposed ply or belt, flats or audible leaks.
- A 90-day trailer inspection is common carrier practice within the 396.3 maintenance programme, not a federal interval.
- Roadside out-of-service decisions use the CVSA criteria, which are updated each year from 1 April.
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What is a DOT trailer inspection checklist?
A DOT trailer inspection checklist is a structured form used to document the inspection of commercial trailers in accordance with the Federal Motor Carrier Safety Administration (FMCSA) regulations under 49 CFR 396. Trailers are subject to the same inspection requirements as the power unit, and many of the most common roadside inspection violations, including brake defects, lighting failures and tyre issues, occur on the trailer rather than the tractor. This checklist covers coupling devices (kingpin, fifth wheel, locking jaws, glad hands, safety chains, air and electrical lines), brake system (air brakes including slack adjuster stroke, brake drums, linings, hoses, valves and spring brakes, or electric brakes including breakaway system), lights and reflectors (tail lights, brake lights, turn signals, clearance lights, marker lights, side reflectors, reflective tape), tyres (tread depth, inflation, condition, matching), suspension (springs, air bags, U-bolts, hangers, shock absorbers), frame and body (cracks, welds, crossmembers, floor condition), landing gear (crank operation, pads, structural integrity), and cargo securement (tie-down points, bulkhead, sides, tailgate, securement devices). Working through it before each trip helps carriers catch trailer defects before a roadside inspector does. Under 49 CFR 396.17, each trailer must also pass a periodic inspection at least once every 12 months, covering the components listed in appendix A to Part 396 and carried out by an inspector qualified under 396.19. Carriers that maintain a disciplined trailer inspection program supported by documented records are better positioned to defend their safety rating during DOT compliance reviews and reduce exposure to civil penalties.
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Benefits of using this DOT trailer inspection checklist
- Inspection records: each completed checklist is a dated, signed record of the trailer's condition and any defects, ready for a DOT audit or compliance review.
- Reduced out-of-service rates: the checklist covers the most common trailer violations found during CVSA roadside inspections, including brakes, lights and tyres, helping identify and correct them before a stop.
- Brake system safety: dedicated brake inspection items cover slack adjuster stroke, air leaks, drum condition and lining thickness, which are the most frequent out-of-service violations for trailers.
- Coupling integrity: inspecting the kingpin, fifth wheel, locking jaws, glad hands and safety chains helps prevent separation incidents, one of the most catastrophic trailer-related failures.
- Improved CSA scores: consistent trailer inspections and defect correction improve your carrier Compliance, Safety, Accountability (CSA) BASIC scores, particularly in the Vehicle Maintenance category.
- Cargo securement verification: the checklist includes cargo securement items to confirm that loads are properly restrained, reducing the risk of load shifts and spills.
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- Schedule services by odometer, engine hours or date for every vehicle.
- Keep fuel receipts and service records with each vehicle's inspections.
- Record repair costs on each work order against the vehicle.
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What to include in a DOT trailer inspection checklist
This DOT trailer inspection checklist covers 14 key areas:
- Trailer details: unit number, VIN, year, make, type (dry van, flatbed, reefer, tanker, etc.), registration, carrier name, date, odometer or hub miles.
- Inspector details: name, qualification, location, date.
- Coupling devices: kingpin condition (wear, cracks), fifth wheel plate and locking jaws (from tractor side), glad hands (seals, connection), air lines (no leaks, no rubbing), electrical line (connector pins, lights functional), safety chains or cables.
- Brake system (air brakes): service brake operation (trailer brakes apply when trailer supply is pulled), slack adjuster stroke (within adjustment limits per FMCSA), brake drums (cracks, scoring, heat damage), brake linings (thickness above minimum), brake hoses and tubing (no leaks, no rubbing, properly secured), air valves (relay valve, ABS modulator), spring brakes (park brake holds), ABS indicator light (on dash, functional).
- Brake system (electric brakes, if applicable): breakaway system (battery charged, switch functional), brake magnets (condition, wear), wiring (no chafing, proper connections).
- Lights and reflectors: tail lights, brake lights, turn signals, clearance lights (front and rear), marker lights (side), side reflectors, reflective tape (conspicuity markings per FMCSA), licence plate light.
- Tyres: tread depth (minimum 2/32 inch for trailer tyres), inflation (within manufacturer range), condition (no cuts, bulges, exposed cord), matching (same size, type on each axle), valve stems and caps.
- Wheels and rims: lug nuts (torqued, no missing), hub seals (no leaks), rim condition (no cracks, dents), wheel bearings (no play, no noise).
- Suspension: springs or air bags (no broken leaves, no leaks), U-bolts and hangers (tight, no cracks), shock absorbers (if fitted), axle alignment (visual check for tracking).
- Frame and body: frame rails (no cracks, no broken welds), crossmembers (intact), floor condition (no holes, structural integrity), sides and roof (if enclosed), doors and seals (operational, no damage).
- Landing gear: crank handle (operates smoothly, locks in stowed position), gear legs (no bending, no cracks), pads (present, not excessively worn), structural mounting.
- Cargo securement: tie-down points (intact, rated), bulkhead or headboard, sides and gates (secure), securement devices (straps, chains, binders in serviceable condition), load distribution (within axle weight limits).
- Defect record: item, description, severity (out-of-service, repairable), action required.
- Sign-off: inspector and driver signatures.
How to use this DOT trailer inspection checklist
- Record the trailer details, inspector details and date. If performing a pre-trip inspection, also record the power unit information and coupling status.: Enter the trailer unit number, VIN, year, make, type (dry van, flatbed, reefer, tanker), registration, carrier name and current odometer or hub mile reading. Note the inspection location and whether this is a pre-trip, 90-day or annual inspection. If coupled, record the tractor unit number.
- Inspect the coupling area: check the kingpin for wear and cracks, inspect glad hand seals and connections, check air and electrical lines for leaks, rubbing and proper connection, and confirm safety chains or cables are in place.: Examine the kingpin for visible wear, mushrooming or cracks. From the tractor side, verify the fifth wheel plate is greased, the locking jaws are fully engaged and the release handle is seated. Check each glad hand seal for cracks and confirm both air line connections are secure with no audible leaks. Inspect the electrical pigtail connector for bent or corroded pins and confirm all trailer lights illuminate when connected.
- Inspect the brake system: have someone apply the trailer brakes while you check each wheel for brake function. Measure slack adjuster stroke with brakes applied (must be within FMCSA limits). Inspect brake drums, linings, hoses, tubing and valves. Verify ABS indicator light.: With the engine running and air system fully charged, pull the trailer air supply knob to apply trailer brakes. At each wheel, mark the pushrod position at rest and at full application, then measure the stroke. For a Type 30 chamber the maximum applied stroke is 2 inches. Inspect each brake drum for cracks, scoring or heat discoloration. Check lining thickness against manufacturer minimums. Trace air hoses and tubing for chafing, leaks and proper securing. Confirm the ABS indicator on the dash cycles correctly at startup.
- Walk around the trailer and check all lights and reflectors. Have someone activate turn signals and brake lights while you observe from the rear and sides. Check reflective tape (conspicuity markings) on both sides and rear.: Verify that tail lights, brake lights, turn signals, clearance lights (front and rear), side marker lights and the licence plate light all illuminate correctly. Inspect conspicuity markings (reflective tape) on both sides and the rear per FMCSA requirements. Confirm all reflectors are clean, unbroken and securely mounted. Replace any burned-out bulbs or cracked lenses before departure.
- Inspect tyres on each axle: check tread depth (minimum 2/32 inch), inflation, condition and matching. Check lug nuts, hub seals and rim condition.: Use a tread depth gauge to confirm every tyre meets the 2/32-inch minimum in at least two adjacent major grooves. Check inflation by visual inspection or tyre gauge against the manufacturer rating on the sidewall. Look for cuts, bulges, exposed cord, flat spots and sidewall damage. Confirm tyres on each axle are the same size and type. Check that all lug nuts are present, torqued to specification and free of rust streaks that indicate loosening. Inspect hub seals for oil leaks and rim flanges for cracks or dents.
- Inspect the suspension (springs or air bags, U-bolts, hangers), frame (rails, crossmembers, welds), body (floor, sides, roof, doors), and landing gear (crank, legs, pads).: Check leaf springs for broken, shifted or missing leaves. For air-ride trailers, inspect air bags for cracks, leaks and proper inflation. Verify U-bolts and hangers are tight with no visible cracks. Walk the length of both frame rails looking for cracks, corrosion holes or broken welds on crossmembers. For enclosed trailers, check floor integrity by walking the full length, inspect side panels and roof for damage, and test all doors and seals for proper operation. Operate the landing gear crank to confirm smooth travel and check gear legs and pads for structural damage.
- If loaded, inspect cargo securement: verify the number and condition of tie-downs meet FMCSA requirements for the commodity, check load distribution and confirm securement devices are in serviceable condition.: Count the tie-downs and compare against FMCSA 49 CFR 393.106 requirements based on the length and weight of the load. Inspect each strap, chain and binder for cuts, fraying, kinks and proper working load rating. Confirm the load is centred between the axles and does not exceed axle weight limits. Check that dunnage, blocking and bracing prevent lateral and longitudinal movement. For flatbed loads, verify edge protection is used where straps contact sharp edges.
- Record any defects and determine whether the trailer is safe to operate. Out-of-service defects (per CVSA criteria) must be corrected before the trailer is moved. Sign and date the checklist.: Document each defect with a description, severity rating (out-of-service or repairable) and the corrective action taken or required. Reference the applicable FMCSA regulation or CVSA out-of-service criterion for each item. If any out-of-service condition exists, the trailer must not be moved until repaired. Have the inspector and driver both sign and date the completed checklist. Upload or file the record per your carrier document retention policy.
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Get the free templateEnter your email above to download the full DOT trailer inspection checklist as a PDF.Back to download formHow often should you complete this checklist?
Before every trip the driver must be satisfied the vehicle, including the trailer, is in safe operating condition (49 CFR 396.13). Drivers must also review the last DVIR for the trailer, if one was required. In addition, each trailer must pass a periodic inspection at least once every 12 months (49 CFR 396.17), covering the components in appendix A to Part 396 and carried out by an inspector qualified under 396.19. Carriers should also conduct routine maintenance inspections at intervals appropriate to the trailer type and usage, typically every 90 days or per the carrier maintenance programme. Reefer trailers require additional checks on the refrigeration unit. In MapTrack, you can schedule pre-trip, 90-day and annual inspections per trailer and track compliance across your entire fleet.
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Frequently asked questions
Applicable regulatory standards
This template is a starting point. Check the current requirements that apply to your equipment, work and location. The template alone does not establish compliance.
| Standard | Edition | Clauses this template relies on | Source |
|---|---|---|---|
| 49 CFR Part 396, Inspection, Repair, and MaintenanceSystematic maintenance, the driver's check before driving, and the 12-month periodic inspection by a qualified inspector. | Current eCFR text, up to date as of 2026-10-22 (read 2026-10-26) |
| US Federal Motor Carrier Safety Administration (text via eCFR) |
| 49 CFR Part 393, Parts and Accessories Necessary for Safe OperationTyre rules: 2/32 inch tread on trailer tyres, and no exposed ply, flats or audible leaks. | Current eCFR text, up to date as of 2026-10-22 (read 2026-10-26) |
| US Federal Motor Carrier Safety Administration (text via eCFR) |
| North American Standard Out-of-Service CriteriaRoadside out-of-service criteria, updated each year from 1 April; the 2026 edition applies now. | 2026 edition, effective 1 April 2026 | Whole instrument | Commercial Vehicle Safety Alliance (CVSA)Sold by the publisher |
49 CFR Part 396, Inspection, Repair, and Maintenance
Edition: Current eCFR text, up to date as of 2026-10-22 (read 2026-10-26)
Systematic maintenance, the driver's check before driving, and the 12-month periodic inspection by a qualified inspector.
- 396.3: Carriers must systematically inspect, repair and maintain vehicles they control; records for vehicles controlled 30 consecutive days kept where housed or maintained for 1 year, plus 6 months after.
- 396.13: Before driving, the driver must be satisfied the vehicle is safe, review the last report if one was required, and sign it acknowledging the repair certification.
- 396.17: Each vehicle must pass a periodic inspection of the Appendix A components at least every 12 months, with proof carried on the vehicle.
- 396.19: Annual inspectors must know the criteria and methods, and hold government-sponsored training or a state or provincial certificate, or 1 year of training or experience.
- Appendix A to Part 396: Minimum periodic inspection standards: the components and defect criteria an annual inspection must cover, from brakes to tyres and wheels.
US Federal Motor Carrier Safety Administration (text via eCFR)
49 CFR Part 393, Parts and Accessories Necessary for Safe Operation
Edition: Current eCFR text, up to date as of 2026-10-22 (read 2026-10-26)
Tyre rules: 2/32 inch tread on trailer tyres, and no exposed ply, flats or audible leaks.
- 393.75: Tyre rules: no exposed ply or belt, separation, flats or audible leaks; 4/32 inch tread on front wheels of buses, trucks and tractors, 2/32 inch elsewhere.
US Federal Motor Carrier Safety Administration (text via eCFR)
North American Standard Out-of-Service Criteria
Edition: 2026 edition, effective 1 April 2026
Roadside out-of-service criteria, updated each year from 1 April; the 2026 edition applies now.
Commercial Vehicle Safety Alliance (CVSA)Sold by the publisher
Each source was read at its publisher and the page checked on 26 October 2026. The publisher's current text is the authority.
DOT Trailer Inspection Checklist preview
The numbers behind this DOT trailer inspection checklist
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<div style="max-width:480px;font-family:system-ui,-apple-system,'Segoe UI',Roboto,sans-serif;border:1px solid #E5E7EB;border-radius:12px;padding:20px;background:#ffffff;">
<p style="font-size:12px;font-weight:700;letter-spacing:0.05em;text-transform:uppercase;color:#071D49;margin:0;">Free template</p>
<p style="font-size:18px;font-weight:700;color:#071D49;margin:6px 0 0;">DOT Trailer Inspection Checklist</p>
<ul style="margin:12px 0 0;padding-left:18px;color:#374151;font-size:14px;line-height:1.6;">
<li style="margin:4px 0;">Trailer details: unit number, VIN, year, make, type (dry van, flatbed, reefer, tanker, etc.), registration, carrier name, date, odometer or hub miles.</li>
<li style="margin:4px 0;">Inspector details: name, qualification, location, date.</li>
<li style="margin:4px 0;">Coupling devices: kingpin condition (wear, cracks), fifth wheel plate and locking jaws (from tractor side), glad hands (seals, connection), air lines (no leaks, no rubbing), electrical line (connector pins, lights functional), safety chains or cables.</li>
<li style="margin:4px 0;">Brake system (air brakes): service brake operation (trailer brakes apply when trailer supply is pulled), slack adjuster stroke (within adjustment limits per FMCSA), brake drums (cracks, scoring, heat damage), brake linings (thickness above minimum), brake hoses and tubing (no leaks, no rubbing, properly secured), air valves (relay valve, ABS modulator), spring brakes (park brake holds), ABS indicator light (on dash, functional).</li>
<li style="margin:4px 0;">Brake system (electric brakes, if applicable): breakaway system (battery charged, switch functional), brake magnets (condition, wear), wiring (no chafing, proper connections).</li>
<li style="margin:4px 0;">Lights and reflectors: tail lights, brake lights, turn signals, clearance lights (front and rear), marker lights (side), side reflectors, reflective tape (conspicuity markings per FMCSA), licence plate light.</li>
</ul>
<p style="font-size:13px;color:#6B7280;margin:14px 0 0;padding-top:12px;border-top:1px solid #E5E7EB;">Free <a href="https://www.maptrack.com/templates/dot-trailer-inspection-checklist" style="color:#071D49;font-weight:600;text-decoration:none;">DOT Trailer Inspection Checklist</a> by MapTrack</p>
</div>Free to reuse, including commercially. This template is published under a Creative Commons Attribution 4.0 licence. Copy it, adapt it, put it on your own site or in your own docs. All we ask is that you credit MapTrack with a link back to this page. The snippet above already includes that credit, so if you use it as-is you’re covered.
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The MapTrack DOT trailer inspection checklist contains 25 checks across 7 sections.
- Short attribution
- MapTrack DOT Trailer Inspection Checklist, https://www.maptrack.com/templates/dot-trailer-inspection-checklist
- Reference list
- MapTrack. (2026). DOT Trailer Inspection Checklist [Checklist template]. Retrieved from https://www.maptrack.com/templates/dot-trailer-inspection-checklist
Free to reuse with credit under a Creative Commons Attribution 4.0 licence. If you’d rather link straight to it, the page is https://www.maptrack.com/templates/dot-trailer-inspection-checklist.
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