1981 Chevrolet Walk-In Vans Sales Folder. 1981 Step-Van. An important step ahead. Chevy Step-Van is as versatile as it is tough. It has proved itself adaptable to the demands of many different jobs, and yet it's still as ruged as ever. And it's roomier. But for 1981, Chevy Step-Van goes even further - it makes an important step ahead with an improved suspension, interior and body. 1981 Chevy Hi-Cube Van Delivers More...From the Ground Up. A sturdy foundation: The forward control chassis. Specifications on the back. Condition: Kind of wrinkly/crinkly from moisture damage. Can see outlines from moisture down one of the folds. See pics.