your worst case is when you have a car in the air on a 2 post lift and then you put a lateral load on it(something pushes on the front or rear of the car). best case the car falls off the lift worst case the car and the lift tip over together and break out a chunk of the floor for good measure. adding the rebar allows more of the slab area and its weight to counteract the overturning force.Great progress!
Mine is finally moving along too. Grading/concrete guy is scheduled, permits are in for review, and I finally met with the local power company to relocate my power line that's down the middle of my proposed garage floor.
I'm doing a 2 post. We're going to use rebar and drop the slab to 6". The majority of the lifts I'm looking at (9K-10K capacity) only require a 4" slab.
The majority of the 4 posts one I see only require a 4" slab as well.
I'd rather have the extra thickness, especially on a 2 post.