Phoenix to Yellowstone National Park
Early planning stages for a trip to Yellowstone National Park from Phoenix, Az. We're pulling a Rockwood 2608bs with a 2008 Toyotal Tundra with the 5.7l V-8. I'm interested in the number and severity of steep grades going north from Phoenix on the I-17, over to the I-15, and continuing on the I-20.
Thanks for any information.