The trailer utilizes sealed bearings that will wear out over time, how quickly will depend on use, including speed and weight of the load. The bearings are not serviceable.
The bearings size 6302-2RS. Each wheel requires 2 bearings. These bearings can be sourced at local bearing store or online, we do not stock the bearings as a replacement part.
If you have additional questions please let us know here or by calling customer service at 888-925-4621 M-F from 7 to 4 PT.