It's just a thought. Even though the original BMW K bikes didn't have a loop frame, a couple of companies designed kits that would mount to them. I'm thinking that a 1200 Sport might make a nice side car tug. A good riding friend of mine would probably dissuade me from doing this, since as he says, there isn't a pothole you don't hit, and a sidecar gives you a real workout. Just mulling a few things over. Maybe this would be better if I were to start with something smaller than a Sport-based side hack, maybe more on the order of a Royal Enfield.
Bob
