Originally Posted by
robow
Do you have any examples or photos of these?

This first one is from
Work Cycles in Amsterdam. It is a specialized freight hauler, but they also make racks that can be fitted to other types of bikes.The other is one of their standard city bikes. I believe Azor sells a rack that is compatible with most of their bikes. Someone in the US was selling a rack that would fit on most diamond frame bikes with standard tubing that was head tube and frame mounted but I cannot find the link to it.
Aaron