Once your drag that road salt into the garage and it soaks in the concrete, it is there for good and rusts everything near it. I layed down plastic and covered it with good used carpet, and this helped a lot, but I still see some rust on any metal tools and parts near the floor. I was hoping to clean out the garage, insulate it, and lay down more plastic, but the summer was way too short to get it done.
A couple guys in our club have those air bags, and they like them.