I have a Direct Lift 4 poster with the sliding jacks. It does everything I need it to do and I'm able to park two cars in what was one space.
The safety lock system is as good as any I have seen, all in it was about $2K if I recall, although we did it as a group buy and got some extra discount.
I considered a 2 post, but they usually have an upper cross member requiring more height clearance. That plus they require securing to the floor and you need to be sure your garage floor is sufficient for that.
Julian
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