But the cautions about HOA's and local zoning ordinances could be a problem, depending on the locale. Besides being an ex fire service guy, I also worked at one time delivering products for a small petroleum bulk plant in Nevada. Had a ton of customers with 150-200 gallon storage tanks on racks (outside) at their homes/farms. That was a pretty 'normal' thing back in those days. But that was mostly a rural situation...if that's your case I don't think there would be much concern.