DaNish
We too went for the drawer from Calicap.de. It is the 80 cm version so the back seat is 2-3 cm further forward than standard. There is a cross support under the drawer, close to the back of the van, but it is secured in the rails close to the seat.
We bought some nice euro boxes too, but made at slight mistake. Since the drawer extends further than the shelf, then the seatbelt guide on the left hand of the back seat is over the drawer, when the bed is made. So at that point there is much less space for a box than under the rest of shelf. So one of the boxes does not fit. But otherwise it is a really nice setup and suits our needs well. The idea with the 2 boxes on top of each other is boots and shoes in the bottom and rain gear in the top. Wet clothes do not drain in the boots and muddy boots do not touch the jackets and trousers.
We bought some nice euro boxes too, but made at slight mistake. Since the drawer extends further than the shelf, then the seatbelt guide on the left hand of the back seat is over the drawer, when the bed is made. So at that point there is much less space for a box than under the rest of shelf. So one of the boxes does not fit. But otherwise it is a really nice setup and suits our needs well. The idea with the 2 boxes on top of each other is boots and shoes in the bottom and rain gear in the top. Wet clothes do not drain in the boots and muddy boots do not touch the jackets and trousers.