BigDog,
If you need to start replacing parts, this is the online outlet that I used when doing over my snowmobile trailer after 10 years. For me the decision was easy. You can get an entire hub with the bearings seals, studs, nuts and cover for $33-$38 depending on size.
http://www.easternmarine.com/HUBS-Tr...heel-Hub-Kits/
BT