Cool find, Bob,
Those videos are an outgrowth of the original Cold Climate Research Dept. at the University of Alaska Fairbanks. Some years ago, an engineering dept. prop & local builder started by giving seminars & supplying literature on building in the Arctic. I attended a couple of them (& still have the books) before building my own off the ground cabin & a larger home for a friend. Since then. the university has it's own research building & much of the information is available on the internet.
http://www.cchrc.org/Since moving to the mid-west & buying a home, I've realized how little thought is given to energy use & interior climate.
A list of articles, some of which apply to building a trailer (insulation, vapor barrier, climate control, ect.)
http://www.cchrc.org/publicationsBTW that R-30 floor video is just an example, a real Artic floor should be at least R-50.
Fred