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 ...
Not a bearing expert, but what do the corresponding areas on the shafts look like? Could this be on the side that would carry more vertical load and the bearings were a hair too loose or not seating correctly against the shafts? The way the "stain" is about 120 degrees around the circumference and looks to be a bit wider at the center of it kinda suggests that??
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