I've never used the rubber plug type caps. The spring loaded Bearing Buddy type have a bypass hole to try to keep too much pressure off the seal, but it is still easy to push grease past the seal, or blow it out. Got to be real careful! Bearings are not intended to run packed completely full of grease, they tend to overheat, with no room for expansion the grease has to go somewhere, so it pushes past the seal.
Getting water in trailer bearings is not a real big problem under normal use. But boat trailers, or any time the axle gets submerged, nearly impossible to keep it out. What happens is the air and grease inside the hub are hot and expanded, it hits cold water, contracts, and sucks the water right in!
As for China bearings, I wouldn't be too afraid of them. Nearly all bearings are imported.
Here is a chart with common bearing numbers and dimensions. You can check the measurements of the old bearings, get the correct numbers for replacement.
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Today's Featured Article - Show Coverage: Journey to Ankeny - by Cindy Ladage. We left Illinois on the first day of July and headed north and west for Ankeny, Iowa. Minus two kids, we traveled light with only the youngest in tow. As long as a pool was at the end of our destination she was easy to please unlike the other two who have a multitude of requirements to travel with mom and dad. Amana Colonies served as a respite where we ate a family style lunch that sustained us with more food than could reasonably fit into our ample physiques. The show at Ankeny
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