You could always do like the one guy on that site, kailuz or whatever his name was. Have it rollable, move it outside to tilt it, and move it back in.
You can move the car tilted. I needed to get my body out of the garage, so I took a tow chain, looped it around the piece that attached to the firewall, and pulled it out with my Explorer. Without wheels on the tilter. No problems whatsoever.
Depending on how you do the support, it really doesn't have to take much room to roll it. I am also in the overengineerin g side of things, I could have made mine much simpler.
Russ