Yes I have done something similar, but I was on a 3 week road trip this summer. I too went to Yellowstone. I was on Manuals, and slept in the car with my boyfriend at the time. I had the manuals hanging from the sun visor in the car. We went from Michigan to Arizona, to California up the coast to Oregon, then through Yellowstone. I too saw Bears, and Bisson. They just walk along the road. Also in Colorado I climbed one of the Rocky Mountains.
The funny thing is we were driving in the middle of nowhere in Utah where I needed the blue clamps for the dialysis, and I threw the drain bag and all out the window!
Lisa