I did this Rally back in 2007/2008. I went from Orlando to LA in a Z06.
JJ the organizer is a nice guy but it depends what your father is looking to get out of this.
Overall I am done of running these Road Rallies because most organizers make you put stickers all over your car for sponsors which make you stand out like a sore thumb. I refuse to attract that much attention driving across country again.
People with cell phones are so quick to call the police if they see you do anything wrong. I am not saying you are driving like an idiot but if the average person sees 10-15 cars pass them, they will call the police thinking we are racing.
What kind of additional info did you want to know?