I don’t know where you see that, in the Yuma area I see lots of porta-potties with handwash stations attached to the back of harvest crew buses.
Not that I’ve gone inside, mind you...
Dean?
I saw it on several southern TX vegetable farms, and in parts of California’s Central Valley a few years ago, while driving cross-country. Not saying it’s everywhere, but I was surprised not to see any PPs when the fields were full of workers.