Ray,
Thanks for the advise. Actually if you look at the link I posted above they have SEVERAL tri Fuel generators of large sizes.

I was thinking if I got about 5 of those justrite cans, since they have the vapor valve etc. They are build very sturdy. I could store them in my shed without any worries.

With the generator doing 1 1/2 gallons per hours of gasoline, then I could easily have 2 days of fuel, for daily use and just the a/c during the day.

The shed has ventilation in the roof, so any vapors should evaporate. I will use stabilizer and then rotate the gas every 6 months.

I could always add more cans in the future if needed.