Oh, THAT sort of Triporteur! I like anything different. I have played at Renegades m/c dos, and one fellow there has a trike with a jet engine from a Bell helicopter on it. The "maxest" trike I have ever seen was near Plymouth a couple of summers ago, we were returning from shows in Cornwall, and amongst a huge crowd of bikes and trikes I had to rub my brain to get it to accept the sight of a NINE wheeler trike....yes, 9. It had front wheel, forks and handle bars, then TWO rear axles, each with double wheels at each end. Very impressive, though it must take a lot of persuading to get it to deviate from a straight line!