Here's a pic of my Atlas PV10p lift. It can be installed at either 11'10" or 12'2". My ceiling peaks at the lift at 12' so I had to install my lift at the lower setting with only inches to spare but it works o.k. My son is 6' and he said it would work fine for him. If I had the room I would have made it 12'6" but the existing building wouldn't let it fit.
My shop is 12'4" and I have a lift - I am 6'2 and My lift has a safety shutoff It's a 2 post lift - While cars ift fine a fullsize pu it to tall for me to walk under without crouching.