Portacabin dorms round here aren't bad. Not luxurious but safe, warm and airy.
We have a lot of semi permanent workers that work the fields and a local processing plant. They have been coming for decades and the same people return every year, some gain residency and stay. We have a high % of eastern Europeans, a busy social club and a couple of "Polish" delis.
I'm really not un aware of the issues but only have recent experience of local conditions.