For those who require even more cargo capacity on their Yuba Mundo, the good people at Bikes at Work in Ames, IA have created a tow hitch to suit your needs. Their Yuba Mundo tow hitch will fit Mundo V3 and Mundo Classic and may be ordered from their site online. For those of you who are looking for a trailer hitch for an axle mounted trailer, they have a solution for this as well: Yuba Mundo tow hitch for axle mounted trailer.
If you own a Yuba Mundo LUX, you'll want to contact them directly since a custom solution will have to be created.
Of course, their trailers are second to none as well! Learn more about them on their features page.