Have to kind of agree. These sound great in theory. In actual practice, without a source of electricity to run the heating system - and yeah, 15a minimum assuming a space heater, and expect that circuit breaker to pop regularly when the occupant then tries to run a hot plate or kettle or whatever at the same time, not understanding they can't run heat AND an appliance at the same time, so then not only where is that power coming from, but who's paying for it, and what happens when the circuit breakers are endlessly popping? The homeless can probably find plugs (as an RV traveller, they're out there in surpsingly many places), but when the circuit breaker pops 20 minutes later and isn't accessable, then what?
So then the occupant puts a propane heater in there and either asphiates themselves on carbon monoxide, or it bursts into flames. Happens with tents all the time.
The water system? Great idea, but again, yeah, it'll be frozen solid and busted inside the first week.
In actual practice this would end up being just a glorified sleeping box and nothing more. Might as well do away with the cabinets and all that, make it a giant bed on wheels with LOTS of insulation, and hope for the best.
In checking the news it doesn't look like there's been any issues that have made the news at least, so it must be kinda-sorta working at least. But yeah, high monthly operating costs.