Paul,
I used to put 3/4" plywood plates under the A-arms (to protect and distribute loads) and put the car on jack-stands for the winter. I didn't want to leave the suspension unloaded which is why I jacked under the A-arms not the chassis. Lately what I do is to over-inflate the tires (to prevent flat-spotting) and periodically move the cars (sometimes just rolling back and forth a bit). I haven't noticed any ill-effects from my new, lazy procedure.
Mark
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