OMG, I could write a book about all the problems with the rear hub. First problem I had was leaking seals. This was before the trip, so before 100,000 kms, not sure exactly when.
About 130,000kms in, I started developing some lateral play in the rear wheel. The shop took the final drive apart and told me that the crown bearing was wearing. They gave me the option of replacing it ($$$) or they said they it wasn't bad enough that they couldn't remachine it to save some money, so I went that route.
The next problem was around 185,000kms, I had to have most of the seals replaced again because once again I was weeping final drive oil all over the hub. And then just recently, around 200,000 kms I had another bearing wear down, this time it had to be replaced.
From what I read and experienced, the BMW final drive is a design problem and not related to wear or usage. You could baby the thing, ride it to Timmy's and back and have to replace a bearing within 20k, or you could beat the bike month-in and month-out over washboard gravel roads in the desert and only need to replace the seals every 50k...