You maybe able to remove the seat and then put in something else but the technology exists where the chair becomes the bed and doesn't need to be removed so it's not really cool more of pain of where to store the parts, and what happens if the people sitting in the seat want to then sleep in the van where is the rock and roll stored and if you carry the bed and the chairs what about storage and the like?
You miss the point.
With the rails fitted to the basic vehicle you come to the conclusion that suits you
You want a rock & roll bed - Fine its slotted in
As a customer you dont want a rock and roll bed - Fine they slot a couple of seats in
As a customer you would like the choice of either because you have loads of storage space and maybe only need a rock and roll bed once per year - Fine you can have both mr customer
Or maybe you are into outdorrs activites and you have a disabled child - Fine you can do that too
Its not ground breaking but its an example and its a blooming good example imo
Never fit sliding windows to the side of VWs (Or any van for that matter) - They all look like prison hatches and they all leak in one form or the other. From a main dealer history, VW sliders leak, believe me.