Two points: the caravan is clearly in a body shop so the window is likely covered with a protective shield of some sort. Also the door is on the UK nearside given that the top marked light is beyond it in the picture, so it is a British market van? Do Hobby or Tabbert make caravans with UK doors?
No, its not !
That type of window has been used by Tabbert for many years and is one of the distinguishing features of that make.
Also, Tabbert will customise your van with any modifications you want in the build process. They tend to be used and bought by the well off travelling community and showmen.