Convert Generator to run on propane

Update:  After more research I found some favorable reviews on the Forest River site for the "motor snorkel" from US Carburetion.  This fits between the carburetor and the air cleaner and moves the air cleaner out a little...maybe a quarter inch or so.  The other brands have an insert that moves the air cleaner out 1.75 inches or so.  It looks like there isn't room for the other brands to fit inside my Champion generator case.....so motor snorkel it is.  The generator will not have quite the output on gas...loses 10% on propane and perhaps 20% on natural gas according to most people.  According to the motor snorkel folks there is zero loss...but that's what they say.  

Natural gas is still cheaper than gasoline on a dollar per watt basis.  Propane is also cheaper...excepting with the current $1.85 gas price that probably isn't true any more. 

Kit is about $180 for the unit and regulator on the generator and another $50 or so to get another regulator for the propane tank. I will get some quick connects to make it easier to change between natural gas line in my garage and a griller propane tank for use in the pod.  Will order this and install next week.  I'll post back with results for how it works.