If you do it right, there won't be any condensation, that's the point.
2 important laws of physics. 1. heat moves to cold. 2. moisture migrates towards dry.
Up north, relatively speaking, in the winter the inside air is warm and moist, the outside air is cold and dry. We all know cold air cannot hold as much moisture as warm air. The moisture and heat both try to migrate towards the cold / dry air. So the moisture is moving from inside the house to the outside. Makes perfect sense, right?
Down south, the inside air is cold and dry (relatively speaking) and the outside air is warm and moist. So the outside heat and moisture is trying to migrate to the interior.
Read the full study, you do NOT want any air movement under the rigid insulation. If that hot, moist air hits the cold floor it condenses. You have to prevent it from hitting the floor.
Manufactured homes are designed for different climates, we all know that.
Does that make sense?