Pedicabs are not built like typical trikes. I am afraid that all that stuff is just too heavy for what the OP wants though. It would work but he's not looking for a rig that can repeatedly carry 600+ lbs of drunken football fans and bachelorettes. Browse the Mainstreet site though, it might give you some ideas you hadn't previously had.

Axle/Differential Complete Set - Main Street Pedicab Parts

Drive Hub Complete - Main Street Pedicab Parts