hiya all vans have some amount of condensation, glass windows are worst than plastic, it is a good idea to leave a sky light open a little, try the one in the loo
just been away too for the first time and we found the same, condensation in the morning, so we opened the windows and left them open over night and this cured the problem straight away.It wasnt cold because they were only opened on the first notch., hope this helps. sue