Ralph, transporter has loads of different models, no slider, 1 or 2, barn doors or hatch style.
Second row of seats is a window van
Can be mounted backwards, behind front ones, if you just get a plain van, look out for companies that do taxi conversions for seats, windows etc.
Two models , long wheel base about a foot longer than standard.
I tend to take fron wheel out of bike, and put it across the rear (bike upside down)
VW website for facts and figures?