We've had three -- the first was a 1963 commercial model (ex-Chicken Delight delivery truck) had no side windows - had clamshell doors on BOTH sides--rear area was strictly bare bones--all metal--no seats, carpeting-=-that made it easier to scrub it and hose out all the accumulated chicken grease. My used car dealer dad bought it at a dealer only auction as transportation home--paid $20 (that was 1968). We took that one to KC and camped in Colorado (over Longs Pass--around 15,000 ft elevation--guess the motor might have been making 20hp there)--many hours in 1st gear. Sold it in KC--after painting it with safety yellow lacquer bought at the Bendix plant surplus store --5 gallons--$5.
The second - a 1964 - also had the commercial running gear (larger transfer cases, shafts, etc.) and it also had the clamshell doors on BOTH sides and no rear interior but it did have side windows. I rebuilt everything mechanical--my wife did all the carpentry inside to make it a camper. We spent three months all over New England. Both split window vans could carry more than their own weight.
The third was a curved windshield 1971. My dad had taken it in trade and I intended to do something with it. Drove it home--parked it in the backyard--and there it sat--became my 8 year old daughter's "playhouse". Now its a storage shed. The motor went to a Formula V racer. The tranny to someone building a hot rod beetle. It has factory cabinets and fold out bed--no "pop top". -- Dave