A Chevrolet C 30 Step Van in 1986
The Chevrolet C 30 Step Van was a light-duty to medium-duty commercial delivery truck produced by Chevrolet in the late 20th century.
An example of this vehicle was seen traveling northbound on the Golden Gate Bridge in 1986. (Star Trek IV: The Voyage Home)
The designation "step van" was unique to Chevrolet produced trucks.