I have a paraplegic friend who rides his trike all the time. It is a conventional design with one wheel in front, as is every one I've seen paraplegics use. The front wheel casters, with directional control maintained by differential turning of the rears. One could install a front hub motor if wanted, but you'd have to rig some sort of freehand throttle.
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Best tank ever: 72.1 mpg in February 2005, Seattle to S.F.
New personnal best 'all-city' tank June '08 ... 61.9 mpg!
Thanks to 'pulse-n-glide' technique.
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