For no reason at all, the thought popped into my head about Speeder bikes and Landspeeders and what makes them float. I'm sure that answer sits in one of those technical journals. Something about a "repulsor field" or something.
Anyhow, the real question is, what happens if you stick your hand under there? Would the "field" shove it to the ground and squish it?
To carry the question even further, if they have this "anti gravity" technology that "pushes" objects away, then why don't they use it as a military weapon or sorts? The Battle Droids came in on floating tanks that hovered a few feet off the ground. Take that same ship and turn it on it's side so that the repulsor field is facing the enemy. You could literally back the enemy into a corner that way. No?