Purpose built transportation equipment..
In Eugene there is Human Powered Machines .. a maker of quite capable weight bearing larger Cargo trailers
though the shipping costs may be unsettling
Bikes at Work in Iowa makes a modular bike trailer .. 6 foot long dual wheels ... those sort of adaptations ..
FWIW, I've seen a (PBS TV ) show* highlighting a Compost by bike service in Austin TX.. *( production company in NC)
...
Last edited by fietsbob; 12-27-18 at 11:59 AM.