4 posts work great especially with the sliding jack I had posted the link to. When I want to steam clean under a car I roll the whole thing outside and have at it. When you are working under the car the rails it sits on also make great place to put all the nuts, bolts,parts etc as you are removing them. There is also less chance for error as opposed to a two post. In this forum we are mostly home users and alot of home users are novices when it comes to working on cars and you really need to pay attention when picking the lift points of a car when using a two post. A four post you are driving onto the rails and the main thing to watch for is the locking safety tabs on each corner. I see a two post in my future but I have plenty of room. If I only had room for one I would get a 4 post with casters.
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