I've been making my own carts for years, and here's my take on the muscle cart. In the NorthEast it rains and snows, and to give sandbags, cable, apple boxes etc a chance to drip dry a little, I started making these with expanded metal. Brakes that are super easy to operate and that hold when loaded. No flat tires with large 12" tall tires in back.
4 available at $575 ea.
These make sense if you are in the NYC Metro area. Don't know about shipping.
Pls email me direct: karlkimdp@gmail.com