There are three variations, or policies, of rolling inventory: full-truck, ready-to-go and partial-truck. Under full-truck policy, a trailer is immediately stored in the warehouse yard with its original contents; unloading and reloading occur at the time of shipment. Under ready-to-go, workers unpack what’s not needed for the next order and add to it products that are on that same order; the trailer is then parked until its scheduled delivery. Under partial-truck, only some contents are offloaded into the warehouse; the partially filled truck then waits in the yard until the remaining items are ready to be loaded.