I've got a good friend who's looking at purchasing a 2003 K1200GT. He's quite taken with it, it's got 36K miles, and the price is right.
Somebody has told him, "Make sure to budget for a main seal replacement every 3-5 years." The person that said this had owned a K1200RS, and not only was this his experience, it's also what his BMW mechanic told him.
I'm not a K bike guy, and don't follow this forum close enough to be aware of threads related to K12 rear seals, but is this mostly true? An anomaly to a single K12RS?