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PT SOG gravel base topping

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I'm designing a 6" thick class 5 slab 130' x 33'.  It will be poured on top a  20" deep 1" gravel bed used as solar hot air sink.  Below the gravel bed is bubble/foil/bubble radiant reflective insulation that also serves as a vapor barrier.  My question is what  topping on the gravel will give the proper friction free movement and firm enough base?  Would a layer of pea gravel be a yielding enough surface? Would crushed limestone or possibly caliche (New Mexico) suffice and what thickness?  Would a perforated plastic sheet on top the gravel work?
Thank you.
Don DeVore
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