I greased the front-wheel bearings of my International Scout a few times 50 years ago, but I have not looked at a wheel bearing since. Every year, I pay to have my fifth-wheel bearings repacked, but I...
Take a look at this post for a complete tutorial, complete with pictures, of how to repack your wheel bearings and also how to adjust your trailer brakes. It is stuck at the top of the Towing forum. Barney