Wheelbarrow should work almost as the stockbin, but on a wheel.
For example, you can use it to put inside XXX clay, YYY bricks etc. It would be easier to use for mass-storage things like bricks, boards, ore, because you don't have to take chest, put it on ground, open, put inside, put on sleds, etc etc.
Sure thing, it should be limited to accept only some goods (as i said - i'd love to see rubble, ore, clay, bricks, etc) and just 10% or something like that of maximum stockbin limit.