How Can I Construct a Non-Motorized Vehicle That Can Carry Stuff?
A trailer behind a bike would do it nicely – unless there are balance questions, etc. Then perhaps you should mount two bikes together – bolt or weld connecting pieces between two similar bike frames, then build a box between the bike frames to carry the load. Either connect the two sets of handle bars together, or take off the front wheel of the bike you are not riding and mount the cargobox back a bit to balance the vehicle. Good luck.
