We have a 2010 Bighorn 3670. We are living in the rig and it has been below freezing for a week and today it is a bit warmer. The ceiling light in the hallway is dripping. We took it down and can feel moisture through the small hole above the insulation. Prior to this freezing weather we had constant rain for a month and no leak there. We think it is condensation but wonder if anyone else has experienced this problem. It is a small and slow drip and we probably would not have noticed it except it dripped on my husband's forehead!