I had a Flexit on my K75 for a while back in the 90's. Handling was almost normal, neat feature was the motorized sliding canopy. And I could take the dog without strapping her in. Never really got it sorted out and the 750 struggled to pull the extra weight, a K100 would have been a better tug. The Armec Sidewinder is another variation, the car stays level and the bike leans.