It's a Swedish canopy.
There are metal legs that go down to the bed and bolt to it where a canvas canopy would.
You can drop all three gates and open all three flaps on the canopy.
E-mail me and I will send you pictures of a Tri-Star with this canopy all opened up.

Cheers
Glen

  ----- Original Message -----
  From: SStones
  To: vanagon@gerry.vanagon.com
  Sent: Wednesday, January 22, 2003 7:10 AM
  Subject: Re: 16" Syncro Double Cab on eBay.de

  >
  > > 1990/91 Syncro 16 Double Cab w/112 HP WBX
  > >
  > >
  > http://cgi.ebay.de/ws/eBayISAPI.dll?ViewItem&category=18298&item=3108950573&rd=1

  I've never seen that hard shell thing on a doublecab before. Does anyone
  know if that thing attaches to the liftgates or goes all the way to the
  bed? That is so neat, man I wish I had enough money to buy everything I
  wanted, such a sweet pick-up.