Field Notes - On the Road
A hidden risk on long gravel roads, and the small habit that helps us catch it early.
We'd never really thought about our wheel bearings until we heard about someone else's trip going wrong. A bearing on their trailer overheated on a long stretch of washboard road, seized up, and left them stuck for hours waiting on a tow, hours from the nearest town.
That got our attention. A lot of our longer trips take us down gravel and corrugated roads for hours at a time, sometimes fully loaded, and that's exactly the kind of driving that builds up heat in a wheel bearing over time. Many bearing problems develop gradually. Increased heat can be one of the early warning signs before a failure occurs.
What We Tried First
Before this, checking the wheels meant pulling over and touching the hub cap to see how warm it felt, which is really just a rough guess, and not something you can do carefully at highway speed anyway. We listened for unusual noises and looked for anything that felt different while towing, but none of that really tells you what's happening at each wheel.
We wanted a way to know something was wrong before it became a problem on the side of the road.
Why We Tried an Infrared Thermometer
Eventually we came across a simpler idea: a small handheld infrared thermometer, the kind that reads surface temperature from a few feet away without touching anything. It works with virtually any trailer or RV wheel hub, since you're simply measuring the outside surface of the hub or dust cap. No installation, nothing to swap out.
Note: An infrared thermometer is a simple early-warning tool, not a replacement for proper trailer maintenance or bearing inspection. Temperature differences between wheels can be a sign that something needs attention, but they don't diagnose the exact cause of a problem.
Setup
There's nothing to install. We just keep it in the door pocket of the tow vehicle, and at fuel stops or rest breaks on longer gravel stretches, we point it at each hub and compare the temperatures. The main thing is comparing wheels against each other. One hub running noticeably hotter than the rest is the sign worth paying attention to. It doesn't automatically mean something is wrong, but it's a good reason to inspect the wheel before continuing.
Results
Thankfully, we haven't had a bearing issue since making this part of our routine, so we can't say firsthand how it performs as an early warning. What it has done is give us a consistent way to compare each wheel instead of relying on guesswork. It now takes less than a minute at each fuel stop, and it's one of those simple checks that gives us a little more confidence before heading back onto long stretches of remote road.
Worth Checking Out
If you regularly tow on long trips, remote roads, or rough gravel tracks, an infrared thermometer is an easy way to add another quick safety check to your routine. This is the small one we've been using to check hub temps at every stop:
