I have a similar set up to what Dee mentioned, and I too use it as a squat "rack". I mean, you're not completely enclosed as you would be inside of the rack, so you might not want to get crazy heavy, but I lift pretty heavy with it. It allows me to lift so much heavier than if I had to deadlift the barbell off of the floor, and then a "clean and press" movement to haul it over my shoulders/head. Much less stress on the shoulders.
I would imagine you could at least do that with the push/pull tower.