I may have a solution for you, but I'm not showing any roof racks that are going to connect directly to any fixed mounting points or via rain gutters. You could go one of two directions with this that would allow you to mount a roof platform like the Yakima LockNLoad Platform Roof Tray # Y05044 on your 1999 VW Eurovan.
You could use something like the SeaSucker Monkey Bars Roof Rack - Vacuum Cup Mount - 48" Long - Black # 298-SX6000B, which are the easiest to install option since they... view full answer...