The maintenance problem

Worn bearings, degraded brake components, and compromised wiring don’t announce themselves. They build quietly between service intervals and a trailer that passes a visual inspection can still be carrying a developing fault that heat and load will eventually surface.

We’re seeing fires that trace directly back to maintenance that was compliant on paper but missed what mattered. Grease that wasn’t replaced properly. Bearings that were marginal and kept running. Electrical faults that weren’t picked up until something ignited. By the time the trailer is on fire, so is the cargo.

Service intervals are a minimum standard. They’re not a guarantee.

The operational problem

Even a well-maintained trailer can destroy a load if it never gets a proper rest. Wheel bearings and brake systems generate significant heat under load. Under normal conditions that’s manageable - the vehicle stops, things cool down, grease does its job.

The problem is continuous operation without adequate cooling time. Short stops that don’t allow components to cool, tight turnarounds, back-to-back runs, these all contribute. The trailer keeps moving, heat keeps building, and grease that’s been degrading all day eventually can’t do its job.

Two-up driving arrangements make this worse. A single driver has to stop legally, they have no choice. Under two-up, a second driver takes over while the first rests, and the trailer never stops at all. Not every operator runs this way, but for those under commercial pressure on time and cost, it’s an attractive arrangement. For the bearings and the cargo sitting above them, it’s the worst case.

The common thread isn’t the driver arrangement. It’s commercial pressure time and cost overriding what the equipment actually needs. The cargo pays for it.

The insurance gap

Most carriers policies cover fire. The question is whether there’s any wording that gives the insurer or the operator a meaningful handle on this specific risk.

Usually there isn’t.

Standard maintenance conditions cover service intervals. They don’t cover bearing condition between services, and they don’t cover what happens thermally during a day’s operation. An operator can have a clean service history and still be running well beyond any reasonable thermal limit mid-trip, with someone else’s cargo on board.

That’s the gap.

What actually helps

On the maintenance side, pre-trip inspection discipline that goes beyond the checklist. Bearings, brake components, wiring. If something doesn’t look or sound right, it gets looked at before the trailer moves.

On the operational side, infrared thermometers applied during the trip, not just at the start. Every driver changeover, every fuel stop, at a minimum every 8 hours. If a bearing is running hot, stand the trailer down until it cools and someone has had a proper look. Log it.

Operators who do both are carrying a materially different risk to those who don’t. Brokers who can evidence it at placement should be getting a better result and their clients’ cargo owners should be sleeping easier.

Worth a look

Trailer fires from maintenance failures and continuous operation are a growing loss trend on carriers policies. The good news is they’re largely preventable and operators who get on top of it protect their own loss ratio and keep their premiums under control.

If it’s something you’re seeing in your book, happy to talk through it.