On a much smaller scale, I did the same back in 1982. I hopped on my '77 Honda 750A and headed west. I took no maps, and at that time had no idea of road system in the US. I just never cared about it.
I told my friends that the US is really not that big, I'm already starting in the middle, and will just ride west until I hit the ocean. No maps, compass, cell phone, GPS, or reservations. Just rode the bike at highway speeds until I found the Pacific Ocean.
Not really a big deal. Whole trip there and back was about 5,000 miles and took about 7 days if I remember.
Oh, I also took virtually no tools, spare tires, or even a service manual for the bike. I did wear through a set of tires and one chain. But they each had many miles on them prior to the excursion.
It really was a nice bit of riding and I recommend everyone try it.