Hi Fitzy, sorry to hear about the "brush off" Why am I not surprised ? As I'm about to join the ranks of "Trailer Haulers" too, all my attempts to quantify BMW's /Dealers (down under) response to warrantee issues once you attach a hitch have met with a similar answer. Unrelated issues (e.g. motronic, grip heaters, whatever) you may have a case. But if it's related to the "Drive Train" forget it. We are in the "twilight zone" (rear bearing, clutch, brakes, whatever) with these items. Seems rough to me though. Correctly loaded trailer (10%-15% hitch @ around 35lbs) factored into the total load capacity, careful clutch use etc, shouldn't "automatically cause things to break". If my pillion is say 150lbs, and the hitch is say 35lbs, isn't that the same as a 185lb passenger? Trailer inertia is a consideration sure, but we don't expect 6 sec gate times! Touring is the game, LT's the name.
Look forward to meeting you next year. Merry Christmas. Cheers