It would be nice if we could load the stockpiles directly into the wagon slots by using the wheelbarrow on it. To unload you would just have to do the same.
Reasoning:
- we would have to build over 100 (literally) wheelbarrows in order to carry a lot of stockpiles from one place to another. Make it easier in terms of crafting and being productive = do not force us to build 100s of wheelbarrows;
- loading the stockpiles into the wagons would make it time-efficient and require fewer clicks.