Steam cleaning outside of an RV

Thank you all so very much. We're aware of the rationing issues, and have cut back on our water usage, including the cleaning of our vehicles, a lot. At the same time we're considering the guy the park uses because his system only uses 8 gallons of water to clean an entire 45' coach, and he's one of those small business guys who seems to do a good job and works his a-- off from morning to night. Nevertheless, I see mixed reviews on these kinds of systems, but since we have to spend so much now on medical and will never be able to afford to replace or repaint this wonderful (and now 11 year old) coach, I'm going to pass on him.

My wife and I both appreciate all your opinions. Thank you so much for all your kind suggestions.