Wouldn't worry about the roads you'll b eon.
If you're concerned about grades then you might want to check into the mountain grades guide (don't remember the exatc name).
Also, if you're Good Sams their website for trip planning allows you to specify (not perfect!) to avoid certain types of roads, tunnels, etc.
2011 Airstream Classic Limited
2011 GMC Sierra 2500HD Duramax/Allison