Last Friday we were in the peak district during the blizzard and the 4 way roof light which at 60MPH keeps out any water ended up full of snow even though it was closed and the van was pitched, the bad news was that we did not find out until we were going to bed as it is situated directly over the bed and lots of the snow had melted and soaked all the bedding through to the mattress.The van looked like a chinese laundry with sheets duvet and topper all either hung over doors or stood up drying off.I think that the van manufacturers should not put any rooflights or vents over beds as the grief it causes is immense`