I think he's got to be talking about this:
Worksman Cycles - Hot Dog, Ice Cream, Popcorn Vending Carts
It's a trike with two wheels in front.
I don't know a whole lot about ebikes, but I'd think an electric friction drive in the rear would be best. After that, a rack mount four stroke. Make sure you're using the right roller or sprocket size, and you'll get all the torque you want.