My 2007 bailey pargent has a side opening roof light, not the normal front opening heki, it also has a winder to open n close, and the frame inside van has built in lighting, I think it's called a (Remis Vario ) although I can't find any make on it, I just wondered were these factory fitted by Bailey or was it fitted by the previous owner, if so why would you change it from a heki as looking at prices for this they're not cheap what would be the advantages for this.