"to level or not to level"

When I store my rig for the winter months outside in Western New York I park the rig on wood planks. I read somewhere that you want to get the tires off of the ground. Also read that the best material to park on is steel! Like you find that laying around. Wood will dry out faster than ground moisture though and I do like the idea as posted to paint it. To the OP's question about using the jacks, I always use mine to take a little pressure off of the tires. In addition, I will raise the front jacks a bit more to create a rear slope for water and later (yuk!) snow run off.