They coordinated with their distributors to complete final assembly at distribution hubs to save on delivery time. Small companies can't do this. They don't have the working capital to retool their assembly plants. They don't have the leverage to negotiate the lowest contracts with vendors. They don't have the breadth to orchestrate nationwide change.
Large companies do.
They are the market leaders for a reason. When they put their minds to doing something . Now these companies have re-emerged from the depths of low operating margins and are generating cash hand over fist. Many of them have become extremely efficient and effective organizations. Because on the whole, these companies are the most profitable in the world.