Replacing trailer bearings is a hub-level job: pull the wheel and hub, clean and inspect every part, repack with grease, and torque the nut correctly.
For the full breakdown, see our best Bearing For Trailer guide.
A growling wheel or a wobble you can feel through the hitch is the usual first sign a trailer bearing is about to fail. Knowing how to replace trailer bearings — clean, inspect, repack, and set the nut right — beats a roadside hub failure and a tow bill. The job runs a couple of hours, needs only hand tools you likely already own, and follows the same sequence for a boat trailer, utility trailer, or camper.