How is this different from Uship? I've used that service and it's pretty good and reasonably priced. They do exactly what you talk about which is allow people to ship things between cities for a pretty reasonable price. You can either specify a price or have shipper bid on it, along with flexibility as to when it gets shipped. People end up being small-time shippers and will buy vans and then just deliver in between cities for as many parcels as they can ship.