Puckster wrote on Apr 12^th, 2009 at 12:53am:

As for the lubing, I check/repack the bearings about every 2 years or so, but I've read I'm supposed to do it yearly...what kind of schedule do you guys have on your trailers?   prouboy

This depends on how often it's used, the number of miles you put on, where the trailer is stored and the overall age of the bearings. If bearings were 32 years old I would check them before every long trip.
Bearing buddies are worth the cost and effort to install if the trailer is used alot, say thousands of miles per year, and/or if it gets dunked in water like a boat trailer.

Also a good idea to feel the the hubs at every gas stop to check for heat.