Propane Fuel Cell
This looks very interesting. https://www.thefitrv.com/rv-tips/the-watt-fuel-cell-coming-to-an-rv-near-you/ .34 lbs/hour for 500 watts. .34 pounds of propane has around 2,150wh of energy, so...
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Actually, I just did the math. According to Onan, a 2500W LP generator uses .4 gal/hour at half load, and .6gal/hour at full load. That gives it an efficiency of 11% at half load and 15% at full load. So, this fuel cell is going to be over twice as efficient than the generator at half load. The fuel cell will run over 123 hours on a 10 gallon tank. A propane generator would run a max of 25 hours at half load, or 17 hours at full load.
