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 ...
Good question. The top and side of the shafts looked like new. I did not visually inspect the bottom (I should have). I think the bottom is where the weight would be. They felt fine when smearing a thin layer of grease on them.
I will be more methodical with the other side. Assuming the marks are on the other other side too, I'll pull the bearings and look specifically for the marks with an effort to note where the mark mated up to the shaft and inspect the shaft more carefully.
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