With a fully loaded luggage setup, how does the KTM 1290 Super Adventure ride two-up?

Adventure bike enthusiasts love to take a passenger or haul a full complement of camping gear and supplies on long trips. With its impressive power numbers and advanced suspension, the KTM 1290 Super Adventure seems like an ideal, fully loaded, two-up touring bike, but how does it handle? Suspension performance, vehicle handling, and overall stability in off-road situations are all a concern. The reason for this question is to learn from riders who have ridden their 1290 Super Adventure on extended two-up trips to find out how it handles with the added weight and how it compares to other adventure touring bikes being ridden in the same scenario.