Consider alternatives to generator.
I have worked with 3 propane fired generators for 4 years-Onan 3.6 KW devices, and have experienced failure about evry 250 hours of operation for each one. Failures varied from electronics problems ( rotor failures, voltage regulator failures) and small engine failures. Onan makes a relatively high-end product, and failures might be more common in less expensive models. (alternate interpretation: onan makes an expensive, crummy product and I got screwed). We have converted to diesel vans with 150 amp alternators, three 12v deep cycle batteries and a 3KW inverter. Failure rate at this point is zero. Makes sense: dodge-mercedes diesel engines are more robust than the lawn-mower engines running a small generator.
Using a 12v storage battery-inverter based system opens up your generating opportunities-use the car, install solar panel trickle chargers, or power a small generator with a bicycle, wind mill, water wheel, hamster, coolie(http://www.majorsurplus.com/Generators-C268.aspx), whatever. The inverter is expensive at higher wattages, but is getting less so and is quite cheap in the lower wattages. This solves the fuel storege/ availability issue, and is perhaps more user-maintainable than a generator.