It has been said: "An impact driver only rotates. It does not hammer on the work piece." An impact driver very much hammers on the work piece. There is more than one way to hammer.
Last week I was removing a stubborn nut and frankly my impact wrench was not doing the job. The corners of the nut were beat up, why, because of the hammering of impact wrench in the horizontal plane. I finally pulled out my breaker bar with a 2 foot cheater to get that grade 8 nut loose.
I would not use an impact wrench on a TC jack to raise or lower, I think it introduces too much stress on the inner gears. Its one thing to hammer on a 50 cent nut another on a several hundred dollar jack.
My 18v Makita will do the job.
Good luck.