Thanks to all for your input. Part of reason for over the top and down is a V10 gasser vs. previous 400 Cummins with Jake Brake. Other than TN, KY, and the Smokies, not sure how the torque, tow/haul, & braking will handle the Rockies. (We were warned off around 10 Sleep.) Also heard about Fishing Bridge construction--- So a bit of a detour over the Big Horn Mtns, but will bring us down via Bozeman to West Yellowstone for a basecamp for about a week before heading south thru the Tetons, UT, and swing toward home.
