floor jacks

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I am trying to repair a breezeway that has a sinking platform and would like to find a floor jack that is 8 foot and will extend to 8 foot and at least 7 inches. The multi part resolutions I have found have the post being disected and this will lead to a wobley condition at best. I would like to find a pole that is 8 foot and has an extension of about 7 inches or so. I can find no such beast. They are all separated by being 4 foot then using double poles to strech it to 8 feet. this would create another point at which will be a woble. Any answers?