Joined: Aug 2010
Posts: 12,760
Likes: 2,114
From: Madison, WI
Bikes: 1961 Ideor, 1966 Perfekt 3 Speed AB Hub, 1994 Bridgestone MB-6, 2006 Airnimal Joey, 2009 Thorn Sherpa, 2013 Thorn Nomad MkII, 2015 VO Pass Hunter, 2017 Lynskey Backroad, 2017 Raleigh Gran Prix, 1980s Bianchi Mixte on a trainer. Others are now gone.
I have seen it once, one guy on a group tour that I was on had one. He pulled a two wheel trailer for his camping gear, thus five wheels total.
He was hard to see from behind because it was so low, if you do that make sure you use one of those fiberglass flag poles to increase visibility. He did and that help immensely.