Storage: The Physics of Foam Under Tires?

[d18mike]

My Box goes into storage next week (soft weeping in background).

While I've stored cars before, I've noticed what seems to be an increasing a number of folks are rolling their parked cars onto dense foam. I didn't do particularly well in physics, so I'm struggling see how this helps modern tires in a material way, espc. if the tires are inflated to 50+psi.

If this really helps, I'm all for it. Anyone experienced "foamers" out there with insight?

Thanks.