Ralph, I thought about that while I was sawing the thing together. I was originally thinking of installing one of those round "fish-eye" mirrors that you install at a corner walkway. Then perhaps putting a large mirror on the back wall of the garage, set at a 45 degree angle so that I could see my "trajectory" from the garage opening. The ping pong balls hanging from the ceiling ended up being the easiest and cheapest solution....and arguably the best!
Even with the visual aids, I recommend anyone driving up ANY ramp for the first time to have someone spot you until you get comfortable with it.
-Dean