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I agree that the worry of flat spots is a little overkill for storage of only a few months. But some of us do park for longer, I'm usually parked mid october to sometime in april sometimes may. So we're talking 6+ months.
You can jack up the car slightly to take the weight off the tires, but not so far that they come off the ground, this will minimize the flat spot, but also keep your suspension from going to full droop (the fear here with full droop is the shocks being a full extend for so long).
I actually do something a little different, not necessarily relating to my tires so much, but my air suspension bags. I air up the car to it's max setting, put some wood blocks under my frame, and air the frame out on them. This supports the weight of the vehicle, then only the suspension weight is on the tires. This protects the rubber of the bag, and the shock since they are not at either extreme in their travel pattern, and also helps my tires since they only have 100lbs or so on them instead of 1200lbs each.
I saw other people also commented on changing of oil, might seem like overkill, but I change my oil before and after storage, takes only 30 minutes for me to do, and oil is cheap comparatively. My process is like this:
before storage drain the oil and change the filter, refill as normal.
After storage just a drain and fill with new oil (no need for filter as the filter should be nice and newish still).
If you only want to do oil once a year, do it before you store the car, not after. Used oil is slightly acidic, and will wear seals and stuff within motor down.
Other recommendations on storing with full fuel and fluids, all should be followed.
If you dont want to leave the car on the tender all year long, I would just pull the negative terminal and you can leave the battery like that for over a year with no issues. I have a battery disconnect switch installed which serves this function.
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