A mounting bar assembly mounted to a materials handling vehicle includes a mounting bar extending from a body portion of the materials handling vehicle, a housing mounted to the mounting bar and supporting at least one electronic device, and cabling that extends to the housing through a hollow interior portion defined within the mounting bar. The mounting bar assembly further includes cabling for providing communication between the at least one electronic device and control structure of the vehicle. The housing is mounted to the mounting bar such that the housing can be situated in a plurality of positions along at least a portion of the length of the mounting bar while the cabling is maintained within the hollow interior portion.