This MB'er made an awesome storage trailer for his motorized bicycle! He used a Burley Tailwagon as a base, and this project looks very professional. Would be a great way to use your MB to take a trip somewhere!
Though I noticed this trailer uses two wheels. I am not sure about the legality, but I think in some states your bicycle can only be street legal if it has 3 or fewer wheels. But I've seen bike trailers with only 1 wheel, so perhaps something similar could be built in that fashion.