A vehicle for transport, fork lift or delivery route operations, for example, includes on-board peripherals which are coupled through a Local Area Network (LAN) into a data system. A LAN data bus provides selective access to the peripherals or data devices such as, for example, a large area display, a keyboard, a printer and a data terminal. The data system controls or provides data on tasks executed by or in connection with the operation of the vehicle. To increase the versatility of the vehicle, the data terminal, multiple data terminals, or any of the other data devices may be removably coupled to the LAN to be operable externally of the vehicle. A mobile mount adapter provides a secure electrical connection of a respective data terminal to the LAN to removably incorporate the data terminal into the data system. The data terminal includes base contact areas which are contacted by spring contacts of the adapter. An "open face" of a disclosed adapter allows a cable for a scanner or other data link to extend from adjacent the base contact areas without a need to remove the extending cable, thereby enabling a cable-connected scanner to be moved and used while the data terminal is disposed in the adapter.