I own a Onan Pro 6000E (portable) generator that I have had no trouble with. However, during the last hurricane gasoline was hard to get and the gasoline I could get was questionable. (Lots of water) I'm considering converting it to a tri-fuel (propane/nat gas/gasoline) I see a couple of vendors on the net with some adapters, but don't have any experience with any of them. Any ideas? I can't find any conversion kits on Onan's website.