In your picture of the garage door you have, it appears you have hurricane bracing that runs laterally across each section of the garage door. Are these screwed into the garage with self-tapping screws? Mine are. If so, just remove only the braces that are below your rear bumper. Probably 2 or possibly 3 braces at most. These braces are probably 2" thick. Mine are 3" thick. Then when you move out of the house, just put them back on the garage. They are only on the garage door for hurricane wind reinforcement. Its a Florida code that all garage OEMs must provide them for garage wind pressure. Also, you can buy a cheap water heater blanket and tape it to your front garage wall. The blanket comes with adhesive tape and covers a lot of wall real estate. Then when you pull forward too far (and trust me, you will pull too far forward eventually) the blanket has a super cushy insulation material that will not mark up your front bumper or damage your paint....even when you pull forward and tap the garage wall. Because you only clear by an inch, using the tennis ball is going to be tough because your windshield is convex in shape. Being a little left, or a little to the right one night after a beer, and your hitting the wall. Even securing 4"x 4" blocks to the floor and you come in a little hot with those KO2 bubble tires, and they will give an inch. Just some food for thought.