Glad to have found this thread - we are going to be hoping to embark on this as well soon. My situation is almost an 11' ceiling but with that pesky beam in the middle at 9'6". I'm unsure if I can make things fit, GT stacked on top of either a hatchback or likely shorter sports car.
We were actually looking at this setup, since I'm going to have potentially four cars in the garage. Not sure if anyone has any experience with this lift, I hadn't seen this until just recently:
https://www.bendpak.com/car-lifts/parking-lifts/pl-6kdt/
Gary - are your posts 10'3? the ceiling?