Thanks for finding this.
It brings back some old memories as I lived in one just like those shown for my first five years of life with Mom, Dad, older sister and the last year younger sister. We didn't move around with it but it was cheap living while my dad built our future home. It was 18'x 6', had a fuel oil stove, ice box, an outhouse out back and we had to carried water for daily drinking, cooking and washing.
Some say those were the "good old days". As a kid I enjoyed them but I sure wouldn't want to go back to them now.
Dave