What do you pay attention to for exhibition caravans ?

Hello ! I might like to buy a caravan which is in the ExpoCamp of Hymer. Characteristic of such WW is that they are 2 years old, these 2 years stood in the exhibition hall, so are practically “new”, unused, only 2 years old and of course reduced accordingly in the price. What do you mean, what should be taken care of here ? Except that many people are in the hall and have probably opened every closet door, actually nothing negative comes to mind. I’m sure that tires don’t like standing around either. Has anyone of you ever bought such a WW? How about the TÜV? The WW has never been registered, the 2 years TÜV, which has a WW, apply from first registration? Then he wouldn’t have to go to the TÜV before registration, or ? Look forward to answers. Many greetings, Markus