I asked this in the travel trailer forum in a thread about seals and decided that asking here might be more appropriate: I repacked the bearings on one side of my trailer that had the factory lube ...
The inner race should not rotate, even slowly. That would be bad news. The axle isn't designed to accommodate that. The balls rotate between the inner and outer races, that's the way it works. If the inner or outer race rotates, that's bad and should be repaired...immediately.
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