Even going down hills would not be much fun... if you hit a curve with any speed at all, off the side of the road you go. Also, any good side winds look like they'd push the thing around.
Probably coaster brakes. Turn the pedals backward a bit, and it stops the wheel, as found on kids bikes and beach cruisers and the like.
There's also some sort of cable running down the center from the front to back...but I can't really determine what that's for. Unlikely to be gears, though.
While this thing here is only a work of art there are many cargo bikes out there that can carry a substantial load, the Yuba can up to 300kg.
http://www.yubaride.com/
Yeah, the classic. We have plenty of those around here (Berlin) as well but they're quite expensive (hand made!). Other cargo bikes get manufactured and are thus cheaper.
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[ 3.2 ms ] story [ 54.2 ms ] threadi'd imagine biking up hills would be the true ordeal.
http://daviswiki.org/Human_Powered_Housing_Project
There's also some sort of cable running down the center from the front to back...but I can't really determine what that's for. Unlikely to be gears, though.
http://www.bakfiets.nl/modellen.php
As well as oversized tricycles to move really heavy objects.