Skyline Koala 21C Wheel Bearing Repacking

Remove wheel
Remove dust cap on hub
Remove cotter pin or locking tab
Unscrew retainer nut.
Pull hub off.
Remove rear seal (replace with new)
Clean all old grease out of bearings hubs and spindles.
Repack bearings. (or just replace if high miles or worn)
Add extra grease to void between hub and spindle (maybe 50% of void tops)
Reassemble
Hand tighten retainer nut.
Snug it up with a wrench to ensure fully seated bearings.
Back it off to loose
Re-hand tighten to no preload resistance and no lateral play in hub.
Button back up.

The make of the trailer does not have anything to do with the bearings - they are all the same.
Take a look at this post, stuck in the Towing forum, for a pictorial on how to not only inspect and pack the bearings, but how to do a brake job/inspection also. :)
Barney

Axle/wheel bearing on most rv trailers repack the same so google several "how to" vids and repack the easy way for you.