How Often to Repack Trailer Wheel Bearings?

The shop I use said it is more of a function of use. Contrary to what you might think he said that they should be re-packed if the RV has been sitting a long time. He didn't define long time....

I do my own. Some years we only do local trips. I always do them during the years we have a big trip planned.

I keep a spare set of bearings and seals in my RV toolbox....