[Uncarved]

I do a fair amount of driving down to the states (I drove down to Texas 2 weeks ago). For Boredom I always find that music get repetitive and boring after the first 4 hours or so. Since I travel alone majority of the time, I end up getting books on tape to listen to. Find that it keeps me preoccupied and the drive doesn't seem to take near as long.
As for the vehicle make sure that it is in decent shape as you don't want to be stranded in some unknown town for days as it gets fixed (it has happened to me). Also take time to sit down and eat instead of grabbing fast food as it gives you time to stretch your legs and do some walking around. Might be a benefit to book a hotel in advanced, on my way down I drove to Billings Montana and the whole town, plus surrounding area was booked up due to a massive Jehovah’s Witness conference.

And #1 of all... if you start feeling tired either switch drivers or grab a room for the night... don't fall asleep at the wheel!

Good luck on your travels