Real-time temperature monitoring
Continuous readings from pre-cool through delivery, with alerts the moment a trailer drifts out of range.
A reefer trailer can pass every mechanical inspection on its tractor and still lose an entire load overnight if the refrigeration unit drifts two degrees out of range at a rest stop nobody's watching. Cold chain compliance isn't measured in miles or brake pads, it's measured in a continuous line of temperature readings that has to hold from pre-cool to delivery, backed by a sanitation record that proves the trailer was clean before it was ever loaded. Reefer trailer inspection software is built around that reality, not a generic vehicle checklist.
12 mo
Minimum record retention required under the FSMA Sanitary Transportation Rule
24 hr
Window to produce temperature and sanitation records if FDA requests them
Pre-cool
Verification required before loading begins, not after the trailer is on the road
Where cold chain compliance actually gets tracked
Pre-cool
Trailer verified at set-point temperature before the first pallet loads
Loading
Product and ambient temperature checked and logged at the dock
Transit
Continuous monitoring for the full route, with alerts on any excursion
Delivery
Final temperature confirmed and matched against the full trip record
A trailer staged overnight at a customer yard or handed off between drivers is still inside this window, even with no driver present to notice a problem. Fleets that sign up for continuous monitoring close that exact gap.
The record that isn't about temperature
A clean trailer is a compliance requirement, not a courtesy
The FSMA Sanitary Transportation Rule requires trailers to be kept free of conditions that could contaminate food, which means a wash-out between loads isn't optional when a trailer moves from an allergen-heavy commodity to one that can't tolerate cross-contact. A sanitation record with no timestamp is functionally the same as no record at all during an audit.
Teams that book a demo usually want to see how a wash-out gets logged against the trailer's ID, not just against a route, so the history follows the equipment.
Stage
What gets logged
Before loading
Interior cleanliness and odor check against the prior commodity
Between loads
Wash-out completion, method used, and timestamp
After delivery
Final condition noted before the trailer is released for its next assignment
Turn cold chain compliance into one clean record
See real-time temperature monitoring, sanitation logs, and reefer PM tracked together on one dashboard.
The reefer unit runs its own engine, on its own clock
Always running
A trailer's diesel-powered refrigeration unit keeps operating even when the tractor is parked, which means it can log more engine hours in a week than the tractor pulling it. A maintenance schedule built around the tractor's mileage misses that entirely.
Engine-hour tracking on the reefer unit itself catches compressor and defrost-cycle wear before it becomes a mid-route temperature excursion. Agencies and carriers that sign up for unit-specific PM scheduling stop treating the reefer engine as an afterthought to the tractor's service plan.
What a real reefer pre-trip actually covers
01
Door seals and gaskets checked for gaps that let cold air escape
02
Set-point and pre-cool temperature confirmed against the load requirement
03
Temperature recorder calibration verified, not just powered on
04
Fuel or battery level for the reefer unit checked separately from the tractor
05
Condenser coils and airflow inspected for buildup that reduces cooling capacity
06
Defrost cycle tested to confirm it triggers and clears correctly
One system for temperature, sanitation, and PM
FSMA-ready records
Temperature and sanitation history exportable in the format FDA expects within a 24-hour request window.
Reefer-specific pre-trip forms
Checklists built around door seals, set-point verification, and recorder calibration, not a generic vehicle form.
Engine-hour reefer PM
Maintenance scheduled off the refrigeration unit's own runtime, independent of the tractor's mileage.
Sanitation logs by trailer ID
Wash-out records tied to the equipment itself, so history follows the trailer across every route.
Excursion alerts and corrective action
Every deviation captured with the written corrective action FSMA expects to see attached to it.
The trailer that drifted two degrees at a rest stop
A load staged overnight at a relay yard sits unattended for six hours while a defrost cycle runs longer than expected, and by morning the product is out of range with no one having noticed. With continuous monitoring and excursion alerts, that same drift triggers a notification the moment it happens, not a rejected delivery the next day. Fleets running this way describe far fewer disputed loads and a sanitation and temperature record that's already built by the time a customer or auditor asks for it. If overnight handoffs are still a blind spot in your cold chain, a short book a demo session will show what continuous coverage looks like on your own routes.
FSMA-ready by default, not by scramble
Set up your first reefer trailer in FleetRabbit and see temperature monitoring, sanitation logs, and reefer PM generate themselves from day one.
Reefer trailer inspection software, answered plainly
What does the FSMA Sanitary Transportation Rule actually require
Carriers must document temperature control through pre-cooling, transit, and delivery, keep vehicles in sanitary condition, and retain temperature and sanitation records for at least 12 months, producible to FDA within 24 hours of a request.
Is a trailer still in scope for monitoring when it's parked and unattended
Yes. A trailer staged overnight, sitting at a relay yard, or handed off between drivers is still inside the compliance window, which is why continuous monitoring matters more than a driver's periodic check.
Why does the reefer unit need its own maintenance schedule
The refrigeration unit runs its own engine independent of the tractor, often accumulating more runtime than the truck pulling it. Mileage-based scheduling on the tractor misses that wear entirely.
What counts as a sanitation record under FSMA
A timestamped log of interior cleanliness checks and wash-outs between loads, particularly when a trailer moves between commodities with different contamination or allergen risks.
What happens when a temperature excursion is detected
FSMA expects a written corrective action tied to the deviation, not just a note that it happened. Software that captures both the alert and the response keeps that record complete.
How fast can a cold-chain fleet get set up
Most fleets start with a handful of trailers to confirm monitoring and reporting against their existing process, then expand fleet-wide. A demo is the fastest way to see a timeline for your operation.
August 26, 2026
By Edward
All Posts
