Trailer Handling During Trailer Swap 
You can determine the ideal location in your transportation chain at which to swap trailers.
Prerequisites
In your master data, you have created transportation zones that contain the source location and target location for the transport. You define transportation zones in SAP NetWeaver Business Client by choosing
Master Data 
Transportation Network Transportation Zones Define Transportation Zones 
.You have defined a strategy for trailer handling for the locations within these transportation zones. You define strategies for trailer handling at a specific location by choosing
Master Data Transportation Network Locations Define Location in SAP NetWeaver Business Client and selecting a strategy for trailer handling on the TM tab page.
Features
The system checks each location to determine whether trailers can be swapped and if so, under which conditions. It does so for each location in the transportation zone containing the source location, and for each location in the transportation zone containing the destination location, by using the trailer handling strategy defined for each location. The following options exist for each location:
Coupling not possible
At these locations, coupling and decoupling is not permitted. This strategy applies, for example, to customer locations.
Coupling possible
At these locations, coupling and decoupling is generally permitted. This strategy is often used for production plants, distribution centers, and other secure locations at which a trailer can be left unguarded for a short amount of time.
Coupling possible only during pickup or delivery
At these locations, coupling and decoupling is permitted only if a freight unit is collected from or delivered to this location at the same time. This strategy is often used at customer locations at which the trailer is parked for the duration of the pickup or delivery process.
Only trailer swap possible
At these locations, coupling and decoupling is permitted only if the trailer is not left unguarded at any time. As soon as a trailer is decoupled from a truck, it must be coupled to another truck. This strategy is often used at insecure locations such as parking lots or service stations.
Activities
You determine the optimal coupling location for a trailer swap in interactive planning by choosing Planning Planning Transportation Cockpit in SAP NetWeaver Business Client and starting Optimizer Planning (see Interactive Planning).