Here comes that trailer ruling that was dealt with, what, 20 years ago. Perhaps he could build an European version of a small Airstream and follow along. That would give him more time (nano-seconds) to keep on the right course.
I'm intrigued with the idea behind using a quick change rearend on a motorcycle engine and losing horsepower (but keeping) easy gear ratio changes rather than using, and simplifying, with a chain drive.
But, then again, that's why we go to Bonneville.