The Trego trolley

[LockH]

... turns any bike into a cargo hauler:
[youtube]wMh9N7QE1_E[/youtube]

http://trego-trolley.com/

Seen here:
https://cyclingindustry.news/trego-trolley-turns-any-bike-into-a-cargo-hauler/

capable of hauling 40KG of goods.

The titling wheel allows the rider to turn into corners (and even carve skate park transitions) all while keeping your load secure and level.