All things considered, It looks like the owner has spent some money already in maintenance & upgrades - kinda speaks to his commitment to his project. Also seems relatively well appointed. The low mileage doesnt impress me simply because any way you spin it the rig is still 30yrs old...but that doesnt mean its not still in great shape.
Really need to walk the Van to thoroughly inspect it...look at the construction - what you see says a lot about the builder (hopefully neat clean fabrication, organised wiring, etc).
That rear box is impressive - I have storage envy!