Full tank of gas with Stabil. Full tank prevent condensation and rust. Stabil prevents settling of fuel.
Battery disconnected or put automatic trickle charger on it. Otherwise, car will drain the battery within one month.
Change oil before storage too. Who wants that sludge in there?
Tires off the ground... not really... just pump all of them to 35PSI to prevent the flatspot or buy one of those gizmo.
Too much work? Then slap on snow tires and just drive em!