Propane conversions make for very clean running engines. This is done for fork lifts that have to operate inside/outside open warehousess. Propane is less efficient than gasoline. Propane provides about 10% less HP and 10% less mileage than gasoline. The good side is that there is less carbon and less that blows by the rings. The oil stay cleaner longer and the plugs do not foul as fast. Propane weighs 4.25 lbs per gallon compared to gasoline at 6 lbs. per gallon.
Having said that, Propane has some disadvantages. It is heavier than air and will settle in low places if it leaks. The tanks are heavier and also require a 20% expansion space. Thus a 5 gallon propane tank is actually 6.25 gallons. The tanks can be refilled at limited places. Plus, Propane costs at least as much as gasoline if not more. In California, it is illegal to dispense propane after dark.
Other than having a cleaner burning engine, always a good thing, it will cost to convert the gasoline engine. It is harder to refill if you run out, and will not provide the power or "mileage" of gas. You would probably want at least a second 5 gallon tank, 40+ lbs. Plus, those tanks are supposed to be recertified every ten years. Unless a long engine life is a consideration, it may not be worth it.
Propane generators are used on 5th wheel trailers because they have no other fuel and they already have propane on board, and the fumes are not quite as obnoxious.
On most motorhomes, they most often use the same fuel as the main engine, even though the motorhome carries a lot of propane. Mine has a 5 KW generator in gasoline, but I have 27 gallons of propane. Still it runs on gasoline, because a similar sized generator would only put out about 4.5 K.W.
Unless you have a compelling reason, or nothing else to do this winter, I wouldn't.
Joe
