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I had a trailer for 8 years with bearing buddies that I never repacked the bearings. I just made sure there was enough grease, but not too much. I also checked the hubs after every tow. They never got very warm.
Now I have superlube hubs which work like a bearing repacker - pushing the old grease out when new grease is pumped in.
Personally, I'd rather carry a $40 hub/bearing assembly and maybe never use it than do the annual messy preventative maintenance on the bearings. Besides, I usually have to spend time fixing broken items to worry about things that ain't broke.
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