Design for street vendors, have a look at this awarded project:
http://www.dezeen.com/2009/03/06/spaza-de-move-on-by-doung-anwar-jahangeer/
The desire to design and share a better future, and empower through technology, reigns supreme in the winning entries of the SOUTH and Most Beautiful Object in South Africa awards.
The R100 000 SOUTH award winner is: Architect Doung Anwar Jahangeer for his Spaza-De-Move-On, a fold-up shop on wheels, conceived to give street hawkers convenience and dignity.