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we looked at this as an option because of that jack. we will probably still get a 4 poster in the future as its good for storage, but adding the jack gives it more practical use as well.
One thing I liked about this one is the jack that can be used to raise the car for removal of wheels.
My problem with 4 posters has always been it makes it harder to do suspension/brake work than a 2 poster.
Great for storage however!