Lieutenant Dan was right. And just like in Nam, in a motor home socks will save your life. It doesn't matter what the weather is like outside, the extra rug on the floor barely helps, it doesn't matter if the heater is blowing directly on my feet; my tootsies are cold. Even wearing shoes. You would be more likely to see an octopus rocketing to Mars than a person walking around here barefoot.
If you want to get technical about it, it has to do with airflow. In a site-built home you have a foundation that the dwelling sits on which creates a buffer between the ground and the house. In a manufactured home, the house sits on cement blocks, but the exposed area underneath is covered all the way around by "skirting." In an RV though, the space is open, so the air flows as freely as it pleases; which pleases me none, because it makes the floor cold, and thus my sensitive little toes!
To combat this, it is essential that socks be worn at all times. On cold days, I've been known to wear two pairs, the outer of which usually gives the impression that my feet were created in the Jim Henson workshop. If the temperature is insanely freezing, I will even put my Wellies on top to trap the body heat in. Which of course look fabulous with any outfit. Who could deny that rubber boots that look like yellow converse high-tops are the utmost in haute couture!
The down side to all of this, is that due to the lack of readily available laundry facilities, and the even greater lack of quarters, I wear my socks for several days at a time. Since it's impractical to put shoes on to walk five feet to the bathroom, my socks are starting to take on an appearance resembling something you might see in some post-apocalyptic time-traveling film, where if my middle school aged self came forward in time to see the grungy footwear on my middle-aged self, she would exclaim "Grody to the MAX!" Well okay, I guess my socks wouldn't be the only thing she'd take issue with...