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Unless they have come up with a solution, the T-Rex is notorious for eating the rear axle bearings in 5k miles. That sounds like a maintenance issue to me. Replace bearings at every oil change?? BMW and Harley I believe were designed to be able to run side cars where the axles will get side loading. Bikes usually only see a verticle loading to the axle bearings. If axle bearings arnt designed to take side loading, early failure is a possibility. There is a few kit trikes from europe that use the BMW drive.
Look into the stability of trikes. I haven't looked at the links posted but I did do a decent amount of research a few years ago. Obviously reverse trike is more stable under braking plus turning and fits the aero tear drop better. Center of gravity needs to stay in the center of triangle to slightly forward of center of triangle for best stability. Local state laws can be frustrating to tag it since some states only concider 2 rear wheels a trike to get motorcycle tag. You also have to have motorcycle license to drive it, even tho it drives like a car
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