Propane Tank Stacking

[twofer]

How is everybody stacking these 500 gallon tanks? More specifically, how is the top tank supported? Do you modify the bottom one to support it or do you build a separate support structure for it?

Along the same lines where is everybody placing these things? I'm thinking about stacking them in the corner of the garage.

 

[Nofossil]

I'd be inclined to weld up a pretty heavy duty angle iron stand. Garage is good - close to heat loads is the goal. More insulation is better, so it would be nice to be able to frame in an enclosure and fill it with fiberglass.