Those pics are of housing thrown up by the construction workers before they begin work on the building. They tear them down and move them with them to the next site.
Actually, that housing is better - or at least as good - as what they had in the country. Only they are at least getting money now - and saving it.
I watch these houses go up and it reminds me of a friend of mine that use to go around the country building Thrifty Drug stores. He had is pickup truck and his travel trailer. But, he was putting considerably more money in the bank.