Love it! Yup, it is a Yuba Mundo that I have set up to carry both kids and the older ones bicycle. I ride a number of steep hills and my knees are telling me I should consider the electric assist option Yuba has. In theory when used with a loaded cargo bike it is like pedaling a single.........Might have to try that.
That's a neat bike. No assist on my Big Dummy, but I get a 17" low gear with the Rohloff hub, so it's that whole, with a long enough lever you can move the earth thing.