i don't use my trailer but once or twice a year. my boat is in a sling behind my house. when i do use the trailer it's usually a long trip. i use any grease that i can get and pump em till it runs out around the caps. my rims are permanently coated with various greases. my trailer is 14 yrs old and has been to the keys, louisiana, and south texas many times. same hubs, same bearings. i have had to reweld the axles to the hubs and replace the springs. might just be good luck, but i think keeping the bearings smothered in any type grease is the trick.
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