Tthank you for the replies so far. My coach is a 2004 Country Coach Inspire with 350 Cummins. My mountain driving experiece with it to date has been both in the Rapid City Rushmore area as well as out to Washington and Oregon and down 101 on this trip. That said, I feel very comfortable with mountain driving so far. The coach handles it well. I pull a 99 Grand Cherokee also.
Hope this helps. I agree with the the difference in distance versus the interstate driving. I am leaning toward the interstate route all the way.
Thanks again for your help and advice.
Steve Vogel
2004 Country Coach Inspire