Jerry, given the enclosed space and humans breathing in there, there was undoubtedly as much moisture in your Casita as there will be in the Escape. The difference might just be that with the carpet on the walls of the Casita, any moisture would be less visible than on the smooth walls of the Escape. It's just one of those inevitable problems of a small enclosed space with us producing moisture. I remember it from tent camping when we tried to close up all the vents to keep warm, on the fabric inside our popup and in the Scamp we used to have.
Keeping it warm inside and providing as much ventilation as possible has worked well for us. The metal around the windows is always our wettest spot. We keep some cheap automotive microfiber cloths just for wiping those off in the mornings when the weather is cold. Keeping the cabinets open helps immensely as does our Dry Mesh under the mattress. When we know we will be in cold weather, we use stuff sacks for our clothes in the upper cabinets. It both keeps the clothes dry and has the added benefit of easier organization.
Eric (and Mary who is in no way responsible for anything stupid I post)