The German company Schlepp launched this 12.5kg Camera Cart on Kickstarter (Click here). They writes:
The SCHLEPP Camera Cart is 30-40 % smaller and 50-75 % lighter than other professional camera carts and workstations with a solid top shelf. SCHLEPP ONE is the only camera cart you can carry with a single hand, or any 3rd party shoulder strap, it weighs less than a beer crate.