Wow! I never thought I'd see another one of these. We have a similar rickshaw at the Bike Oven here in LA where I volunteer. Except ours is not a fancy red color with shiny fenders. It's more like ugly rusty with wobbly wheels (which have something like eighty spokes on them built into a weird six cross pattern!). But it's tons of fun, and we're always pulling people around in it on group rides. Even loaded with two people it's not tough to get up hills. Just the getting started part is hard, but once you get going the weight in the back seems to almost push the rickshaw forward for you.

Now if only it had something better than rod brakes from 1950 that rubbed against rusted rims...

P.S. I recommend setting up some kind of chain tensioner on it. Ours had the tendency of throwing the chain quite often, but now that we put the tensioner on, it hasn't happened since!