I had a Boom trike,based on a VW1200...it was built like a train,but very large....
Best fun on 3 wheels,was one i had,built on a Kawasaki Z1300....6 cylinders,and a beer-keg silencer
it would manage multiple,roundabout drifts,wet or dry,but because everything you could see and touch,was motorbike...you had to constantly remind yourself of the sticky-out bits,behind
Most foolish trike? ...one me and a pal knocked up,for an Irish fella,who gave us a child's tricycle,and wanted something engine-powered,to tow a tiny dog trailer,at 2 mph,in the St Patrick's day parade
We fitted a small Wacker plate engine,and some reduction gears,and hey-presto,we had something that even the Jack Russel looked embarrassed to be associated with....