The bearings we offer like the part # L44649 are high quality bearings. As long as you stay under the speed rating for the tires you have on your hub these would work well and would not fail.
You will need to make sure that you do keep grease in the hub. As long as they are properly greased and your trailer isn't overloaded these bearings would last a long time.
I have included a video below on inspecting bearings and another video on how to pack bearings with grease. view full answer...
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