I originally went to three wheels for my wife's comfort and the possibility of hauling excess un needed camping gear around. We've had a lot of great times / miles in the past 5 years with the hack.
Recently I've been diagnosed with Rheumatoid Arthritis and long distance solo riding has become more of a challenge. We plan on some more long distance hack rides this winter so hopefully I won't fall apart along the road somewhere.
.....wish me luck.