What Charlie said. Full, that tank is going to weigh more than a ton. If you have the location and the materials, you might consider pouring a concrete pedestal for it, so as to get the bottom spigot high enough to easily use. Maybe 6" off the floor, something like that.
When I saw the comment about bi-level, I thought I would show you an alternative I did: Had a half closet under our stairs where they just closed it off during construction. I removed the wall, put two 35 gallon tanks under the stairs, filled them, and replaced the wall (which screws in place with dry wall screws). The second shot is with the closet back to normal.
I'm looking at a similar solution to my water storage needs. I like this product; the only thing I would look at doing is either strapping it to a wall or post to prevent it from falling over.
Do the tanks have to be indoors?
Would you please post the web address where you buy the drums at that price?
Not knowing where you are in Indiana I did a quick craigslist search for "rain barrel" and came up with this 40 gallon barrels for $15. I like having multiple smaller containers of water than one huge container. Contamination and such.
Do you know how cold and for how long it would take several hundred gallons of water to freeze? Need to learn about thermal mass. If where you live it does get down to the negative digits for days at a time you can get solar pumps that circulate the water. Moving water is harder to freeze or submersible heaters that are used to keep livestock water troughs from freezing.
