Re: washing machines in the back of vans!
My wife works at the local food bank, I don’t recall anyone complains of broken washer or the lack of it. It’s far much cheaper to get clothes from charity shops than running a mobile washer.
I had considered on a trailer that would enable to loan a washer on an emergency basis while their washer is being dealt with. Great concept but fraught with lots of complexities. My line of thoughts are window cleaners carry a ton of water in the back and see if some sort of joint venture to make it work. There’s no demand for such thing at the moment. Maybe for campsites/festivals might work?