I have a 2012 Goldwing with 18000 miles, purchased new with the conversion. My trike developed the same unsafe driveshaft issue as hundreds of other MotorTrike Owners.
MotorTrike will replace the driveshaft, but claims the warranty period began when the dealer triked the bike, not when I purchased it new. The yoke came off the driveshaft while riding down the interstate and nearly broke the bike's frame crossmember completely free from the weld and bent the transmission output shaft. Fortunately, with the nearly broken frame, we were able to survive. An $8700 repair to replace the frame (frame is $5300 alone) and output shaft caused by their unsafe kit that they refuse to stand by. Beware MotorTrike. Purchase at your own risk of life.