I have the eBook version (east/west combo) on my laptop and never plan a trip without it - especially in mountainous states:
The Mountain DirectoryAnother handy RV trip planning tool is:
RV Trip WizardRV Trip Wizard is extremely handy for both planning routes and finding places to stay. It's a paid subscription service, but I find it worth every penny. It cut planning time by 2/3 for me on our 3,600 mile, 30+ stop trip last spring.
Rob