Mine is stacked on a home made wood rack that was left by the previous owner. I keep the wood covered with a tarp. Keep your wood away from any wood structures such as house or garage in case of termites.
Thanks mikemci. Clearing the land and making cart paths for the Grankiddies, I had all these little Sweetgum and pine poles, i didn't want to see them go to waist, so I built the roof out of dimensional lumber and the rest out of the poles. The roof is used corrugated metal
Your right, great air flow and stays good and dry.