Not sure how long you've been RVing but you have come to the right place to get all sorts of opinions.
First thing you'll need to do in your coach is RELAX. Now plan your route to enable the most enjoyment possible. If you don't like steep ups and downs, plan so you can minimize the number you will encounter. There are lots of software to help. Here three:
1. Good Sam Trip planning at RV travel – trip planning tools and information from Good Sam Club
2. RV Trip Wizard Home of the Best RV Trip Planner Ever - Give it a try!
3. One Stop Shop Trip Planning One Stop Shop for Traveler Information
Each of these do a little bit different. #3 above actually shows elevations for the route. The Good Sams shows lots of info about your things to do along the route. And #2 helps plan the route in detail to include dates and distances BUT it is an annual subscription.
Bottomline - make the journey the destination. We have a wonderful country and you have chosen our favorite way of immersing yourself in its beauty. Comeback ofter with your questions. Enjoy