Where do you repack your wheel bearings?

I've always taken my trails to my Jayco dealer they rotate the wheels, do the bears and almost always have an issue or two that Jayco covers for us. We do this normally after 12,000 - 15,000 miles which is yearly. They go over several other points while doing the bearings. Maybe this is overkill but to us it is much more important to know they have prepped us for our next trip.