Storing gasoline anywhere out of your direct control is a bad idea. Though I haven't researched it, or read of it being nation-wide (I'm a bit in the dark on this), I'm inclined to believe that you can't get gas without ethanol as an additive now days, and that crap has caused more fuel system problems than we may ever know. And, it's supposed to create a cleaner burn of the fuel, or reduced oxides in the emissions or something. We've had several fuel pump failures with EFI and lots of small engine carb issues as well, all fuel related from this garbage, due to plugged filters and sludge in the tank, and destroyed rubber components in the fuel system. BTW, if you have EFI with in-line filters, I recommend you change the filter every oil-change...if in tank screen instead of in-line filter, well, be ready for plenty of gas tank drops and pump-pulling to clean it out. Anyway, if I could tell the fuel vendors to stick it where the sun won't shine, I would, but it's all you can get here. Even with stabilizer, it will separate more quickly than we'd like to think.
There is at least one fuel stabilizer specifically designed for ethanol, called Ethanol Shield...never tried it, yet, but plan to soon.
That said, any gas you store, even with stabilizer which recommends maximum storage of 12 months will probably stratify and turn to slop long before that 12 months is up. And once it does, it's worthless for internal combustion engines, and will contaminate the container it is stored, which will need to be cleaned out before being re-used. Keep your stored gas in rotation with what you regularly use and you'll be far better off. For any vehicles or equipment which are not used regularly, the gasoline should be completely drained from the tank and the engine should be run until it dies from lack of fuel in the carburetor or fuel system, but if EFI, the fuel should be treated before filling, purging through the system, and then draining and running until stalled, just to improve your chances for not having issues with the residual fuel in the system. A few gallons of treated fuel could then be added to the dry tank every 2-3 months, restart the engine and run long enough to warm the engine to normal operating temps (to prevent water vapor condensation in the crank-case) and purge the fuel system with freshly treated fuel again, then repeat the previous preps for storage again.
Gas sux now days, but we do what we must.