Trailer upkeep?

[gdn443]

Having just put on a new axle on my 6 year old trailer that lost a bearing and grease buddy, what do you guys do to keep it from happening again. I grease it a couple of times a season, but the marina says I will only get 5-7 years on a trailer. I use it mostly for salt water and hose it down well when I get back in. I just can't believe such a short span of life.
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