Quote:
Originally Posted by Vegas69
A four post lift isn't very functional without a jack. Do yourself a favor and buy a 2 post. 
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With a four post you just drive right on and lift. Much more stable, lot less chance of the car moving around. 4" slab is fine, 2 post usually spec 5-6". Two post you gotta pull up hopefully in the right spot and then get all the arms set before you can lift. I've seen a few cars slide off of them. I used them a lot and the average home builder will probably be better served with a four post, most don't even have a thick enough slab to safely mount a two post.