I routinely share lanes on a cruiser, but it's a small one. I spend entirely too much time bobbing and weaving to avoid mirrors and drifting cages to even begin to believe that a Tango could do it safely. One of the reasons we can share safely is our ability to adjust body position in order to avoid mirrors, arms and flung litter (smokes, coffee cups, half eaten burgers, etc.). A rigid vehicle is unlikely to manage this effectively. Not to mention the whole splitting on a GoldWing factor that's already been discussed.
It's sort of cute in an ugly way, and I'm sure it would do well in crowded cities, but I give it a low survivability rating in Bay Area freeway traffic.