If you plan the trip and daily mileage limits along with advanced reservations you will have a better trip than not setting daily distance goals and overnight stops. Give it a lot of advanced planning.
Many decades I took the family on a major RV trip from Connecticut to all the major National Parks in the west and covered about 7,000 miles and countless stops in about 5 weeks. Everyday was planned in advance. Key parks like Yellowstone were reserved a full year in advance. Without advanced reservations getting a site at the RV park in Yellowstone (Fishing Bridge) would not have been possible as all sites are booked a year in advance.
Enjoy your adventure! Happy Camping!