Here in Key West our salt water is supposedly some of the most corrosive in the world, and it does seem that way. Everything deteriorates so quickly. So I replaced the hubs and bearings soon after I bought my DS2 and trailer. No idea how old they were but they just crumbled to mud when I took them out, almost nothing was left. It's been a little less than a year and I noticed the wheels were a little noisy when driving. I took the hub apart and the new bearings I put in less than a year ago were totally trashed and the grease I put in had turned to muddy rusty sludge. The bearings just fell apart when I took them out.
So for salt water sailors, how often should I expect to have to replace my trailer bearings? 3 months, 6 months, a year?