You mean like the smart car, or the citaro bendy-bus?

edit - the luxury car thing is only a fraction of Mercedes-Benz output. They produce loads of commercial vehicles, from light vans and minibuses, up to HGVs and coaches, as well as stuff like roadside mowing vehicles and farming tractors.

Daimler makes lots of stuff other than Mercedes-Benz cars:

http://www.daimler.com/brands-and-products

Even Mercedes-Benz do a few models that I would exactly describe as "luxury" - e.g. the A-class.