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Jerry I have a pretty strong belief in hydraulics being able to hold weigh as that is what they are designed for. I used the auto level system on the manual control to lift the unit until all the tires were hanging after loosening the lug nuts. After four or five hours of getting tires changed from the barely adaquit to the new Sailun's I got back and there was no problem in putting the same size tires back on. Still had plenty of room to install them. With that being said am I willing to crawl under a rig and trust my life on the hydraulics? The answer is no I would also use some type of a positive jack that is mechanical in nature. Just common sense to always have a positive system when protecting life and limb.
Tom Marty
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