Anna Brones of Wend magazine has an article about business that use bikes to deliver goods and provide services. One company profiled, Soupcycle, delivers organic soup. Another Q19, is a house cleaning service that uses petrochemical-free cleaning agents. The article also mentions bike-powered business in Florida (organic produce delivery), Boston (pick-up and delivery service), and Philadelphia (recycling and compost).
Lazar delivers soup to "Souplandistan," an area that covers most of inner Portland, with an electrical assist trike. The battery assist helps pull him and his bike and trailer up some of Portland's hillier streets. Fully loaded the trailer and bike weigh a total of about 200 pounds, but Lazar calculates that he only uses the battery assist about 20% of the time; for the rest, it's all legs.