For short term storage, I'd just park it and not worry.
For long term storage (weeks or longer), I'd probably make some 2x10s, take them to a Rhino Lining or a Line-X place, have them sprayed, then store the rig on top of those. The epoxy coating will keep the wood from rotting, as well as keep dry rot from happening.
There is a lot of debate of using jacks for long term storage or not. As far as I have read, I'd not bother. Suspensions don't wear out by sitting around. They wear out by damage done to rust and miles.