Having owned a Heinkel 3-wheeler, many years ago, I would never consider another. The big issue is ride comfort, since you have 3 chances to hit every bump. The Heinkel had another disadvantage in that the only door was across the front. There was virtually no protection in a crash.
Frank Damp -Anacortes, WA,(DW- Eileen)
ex-pat Brits (1968) and ex-RVers.