In 2005-2006 there was some serious announcements being made by Atwood Industries that they were developing a propane powered fuel cell for RVs.
That development would redefined power generation and power consumption for RVs. It would make all discussions about 6v golf cart batteries, solar panels, miserly usage, and generator maintenance and problems a moot point. It would also have seriously destroyed many existing businesses, (generators, batteries, solar, water heaters, furnaces, and associated maintenance industries).
The fuel cell was capable of generating on-demand 5000 watts, it also heated water, provided heat as a supplementary furnace, and it produced fresh distilled water, (normally just thrown away). Fuel cell technology does exist and kept on being developed and it has caught on in military and hospital emergency power applications, but not so much for RVs.
In mass produced quantities, an RV sized unit would cost just as much a common non-fuel injected gasoline 5000Watt Onan generator.
Since those heady times. the whole discussion about RV appliances completely gravitated towards on-demand water heaters and residential refrigerators.
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