Re: Two post,four post
Another over 70 car guy, here.
I installed a 4 post about 6 years ago. I debated the 2 post/ 4 post question for months. I decided that 2 post made more sense. Then I went out to the garage and decided to drill some small test holes in the floor----I had seen just enough examples where the guy who built the garage had a tendency to cut a few corners that I thought I better check. The concrete floor varied in thickness from 5" to 3"---way too inconsistent for me to be happy with a 2 post. A 2 post relies on the mounting bolts acting in tension while on a 4 post almost all the loads are compression. In my situation, the 4 post was the better choice.
My garage has 10' side walls and conventional roof trusses. I had an Engineer work out what I needed to do to safely remove the bottom chord of the roof trusses in the area where the cars needed that extra room. It was a lot of work, but after 6 years both the lift and the roof are fine.
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