I only keep about 35 gals too.

I would like to ante up the storage up to 150 gallons (30 day supply for generator) before Winter, but my current method doesn't seem like a good idea scaled up.

Also, I have space to put something, out of sight and far from any building. I have noticed a few small farm trailer tanks on-line, and above ground tanks. Below ground sounds like a good idea too, but above ground will eliminate the need for electricity...right?. Does anybody have experience with these types of storage containers?