Go into any auto shop. They generally have one four post(Alignment rack) and 20 2 post. A 2 post gives you so much more room to work. There really isn't much you can't do if you have a screw jack.
Now if you are going to use it for storage primarily and work on the car once and a while then a 4 post is going to be much easier to get the car out of the way quickly.
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Todd
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