I've mentioned it before, but...

I've seen a man twice bicycling at a good clip down the highway with a common $40 hand truck attached to the seat support. At an angle, you can carry a lot of stuff on that hand truck. The guy I saw had about four banana-box sized boxes filled with stuff and firmly covered with a blue tarp. He was moving with traffic (where the speed limit is 30 mph) quite easily.

Does anyone use those solid foam tires that can't be punctured? Bumpy ride?

Sue