How can I manage mobile warehouses (trucks)?

Imagine: a truck (with an ID number) moves from one city to another. At each city, it stays for a week and some products with serial numbers are removed or added. The truck is not emptied, just a few additions and removals as needed. While it is in a city, it is located in the parking of a storage building which has been defined as an inventory "location". While there, we would like to treat the truck's contents as part of the location's inventory. If a customer places an order, we can pick both from the storage building and from the truck. At the end of the week, the truck moves to another city. The contents of the truck should move to the next "location" in one operation.

What OpenERP objects should be used to represent this?