How often does a trailer need a DOT inspection, and what is a fleet PM program?
Every trailer needs a federal annual inspection under 49 CFR 396.17. A fleet PM program keeps you from chasing those dates. At Knox Trailers, fleets of 5 or more trailers get pre-scheduled annual inspection windows, an email reminder 30 days before each one is due, and consolidated billing. For fleets that size, we can also do the inspections at your yard, so trailers stay productive instead of being shuttled to the shop.
Last updated November 12, 2026
The short version
Every trailer needs a federal annual inspection under 49 CFR 396.17. A fleet PM program keeps you from chasing those dates.
- The federal DOT trailer inspection is annual (49 CFR 396.17).
- Fleets of 5+ get pre-scheduled windows and a 30-day email reminder.
- Consolidated billing for fleet accounts.
- Yard inspections available for fleets of 5+ trailers.
What happens if a trailer misses its annual?
It isn't legal to run until it's inspected. That's the point of the reminder: we track your due dates and email you 30 days out so nothing lapses.
Can you inspect at our yard?
Yes, for fleets of 5 or more trailers. We bring the inspector to you, and we can handle brake adjustments, air leaks, lights, and lube service while we're there.
How long does each inspection take?
60 to 90 minutes per trailer when no defects are found. Common defects are corrected during the same visit.
Common questions
How often does a trailer need a DOT inspection, and what is a fleet PM program?
Every trailer needs a federal annual inspection under 49 CFR 396.17. A fleet PM program keeps you from chasing those dates.
What happens if a trailer misses its annual?
It isn't legal to run until it's inspected. That's the point of the reminder: we track your due dates and email you 30 days out so nothing lapses.
Can you inspect at our yard?
Yes, for fleets of 5 or more trailers. We bring the inspector to you, and we can handle brake adjustments, air leaks, lights, and lube service while we're there.
How long does each inspection take?
60 to 90 minutes per trailer when no defects are found. Common defects are corrected during the same visit.
Need the inspection this week?
Call the shop or request a quote and we will get the trailer on the schedule.