I have one of these, 1985 Vanagon ASI camper.  Possibly the last year ASI modified the Vanagon into a camper.  The upper bunk is really not suitable for sleeping, for adults.  The platform shifted and I fell out of mine a few years ago.  I will not get up there again; it's the lower bunk for me!
That being said, it's perfect for the passenger van owner who wants some headroom for camping.  I love my Lola, and wouldn't trade her for a Westy ever.  The "tent" is made from Polyvinyl; is is truly waterproof (a real plus here in the Pacific Northwest).
Ellen
�Be Content with what you have; rejoice in the way things are. When you 
realize there is nothing lacking, the whole world belongs to you.� ~Lao Tzu

> Date: Mon, 26 Aug 2013 18:02:45 -0700
> From: mdrillock@COX.NET
> Subject: FS: add a poptop to your van
> To: vanagon@GERRY.VANAGON.COM
> 
> I have an add-on poptop assembly for sale in SoCal. It is an ASI brand
> from an 85 Vanagon Camper. It is designed to go on a hardtop passenger
> Vanagon. It pops straight up. ASI bought passenger vans from VW and made
> them into campers in the 70s and 80s. It uses a smaller hole cut into
> the center of the roof for standing room when the top is up and for
> getting into the upper bed. This photo shows what it looks like with the
> top popped.
> 
> http://images.thesamba.com/vw/gallery/pix/1039329.jpg
> 
> $250 to any Vanagon list member who comes and gets it in the next week
> or so.
> 
> More info by PM on request.
> 
> Mark