Yes. SAP Transportation Management has supported detailed planning of trailers since 9.0 release via the use of OPTIONAL Trailer Unit documents. Trailer Units ENABLE the modeling of complex trailer scenarios such as drop-and-hook and trailer swap, but they do introduce an ADDITIONAL document into the transportation planning process, so careful consideration has to be given to whether the additional transactional complexity is justified by the enhanced planning capabilities. When introduced, the Trailer Unit document becomes responsible for TRACKING the movement of the trailer, whereas the Freight Order document is responsible for tracking the movement of the power unit and driver(s).

As of release 9.3 support pack 3 SAP TM supports the planning and assignment of driver(s) to freight orders. 

Yes. SAP Transportation Management has supported detailed planning of trailers since 9.0 release via the use of optional Trailer Unit documents. Trailer Units enable the modeling of complex trailer scenarios such as drop-and-hook and trailer swap, but they do introduce an additional document into the transportation planning process, so careful consideration has to be given to whether the additional transactional complexity is justified by the enhanced planning capabilities. When introduced, the Trailer Unit document becomes responsible for tracking the movement of the trailer, whereas the Freight Order document is responsible for tracking the movement of the power unit and driver(s).

As of release 9.3 support pack 3 SAP TM supports the planning and assignment of driver(s) to freight orders.