Grumman-Olson (Olson Kurb-Side) was the most popular manufacturer of these stepvans, used by General Motors. Montpelier Manufacturing, Utility Truck Distributors, Herman Body Company, Dekalb Commercial Body Corp., Universal"Carovan", & Boyertown "Better-Built". Were just a few other manufacturers. Post a few pictures, & I may be able to take a guess at it.
