I am not laughing because we have experienced icing on walls! That is why I advise folks to not cram their cabinets full, pull all items away from the wall, and keep at least one cabinet door to each section of a cabinet open at all times to allow heat to circulate. This applied not only to clothing but all cabinets...you would not want your food items, books, papers, electronics, etc. frozen to a wall!
It is especially easy for ice to form on slide out walls/corners. Many a time we went to bed with visible ice in the corners of the slideouts near the bed.
The culprit is of course extreme cold & indoor humidity. Our experience was that any amount of humidity will cause freezing condensation on walls and of course window frames and glass. Even humidity levels below 10% can cause some icing.
We monitored our humidity with a humidistat and in our cold arid climate it was a struggle to keep humans comfortable with above 20% humidity because the furnaces ran 24/7 drying the air out to nose bleed levels of dryness. We actually had to run a small humidifier to do so which of course keeps humidity higher. If you are using the shower that would not be necessary. We were parked in the barnyard and used the bathroom in the house.
During the day if the sun shines ice will usually melt off window frames, glass and walls if the sun strikes that area. So, a daily drying down is necessary.
But, until we learned that we had clothing stuck to the outside walls, which of course melted making them wet, so they had to be taken out to dry.
Extreme cold is a challenge we can deal with but no longer wish to...we now travel during the nice time of year!
