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Hi Alex,
What you are building is a radiant heat shield. For the best performance you need high reflectivity on the sun side. A white gloss powdercoated steel would be in that respect or at a pinch a gloss white painted roof of some sort. Aluminium also has excellent reflectivity if kept clean and protected/cleaned of oxidation. In fact any of the surfaces should be kept as clean as possible as dirt, dust ixidation, etc will reduce their reflectivity. Perhaps a good hose off in spring in readiness for summer.
In addition to all that use Sheeny, Rainmakers and Julian's(hello guys) excellent suggestions above. Additionally if your van doesnt already have a white roof (most do) then make it so.
Keep cool.
Best
JA
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