I had a Harbor Freight 2000 inverter generator, that got stolen. It had to work hard when I had the heater on anyway. I just purchased the Harbor Freight 3500 inverter generator, and have decided to convert it to multi-fuel (gas, Propane, or LP). Amazon has the kit for that for approx $135, and it has good reviews. There is also a YouTube video on the conversion. My reason? I hate carrying gasoline to the field with me, as I usually camp off-grid somewhere. And I always have a spare propane tank or two with me. Any thoughts, or experience?