[freebeard]

http://justacarguy.blogspot.com/2013/02/the-moon-trike-first-time-ive-ever-seen.html

That's what I meant, your typical one-front two-rear tricycle. They'd be faster backward.

Two-front one-rear is possible


http://justacarguy.blogspot.com/2012/04/2-amazing-photos-out-of-many-from.html

http://justacarguy.blogspot.com/2017/03/aaa-headquarters-at-eighth-and-olive.html

http://justacarguy.blogspot.com/2009/03/1956-heinkel-kabine-cross-between.html