Went through and stayed at Nashville then on to Saint Louis on the return leg of our trip this year. Some of things that come to mind are.
If you are going to go up to Saint Louis then over the RV park at Casino Queen has a shuttle that will take you to the Metro Link Station that you can take to see lots of St Louis.
If you want to take I 40 from Nashville would recommend Petit Jean State Park in Arkansas. A great park for overnight in Oklahoma is the El Reno West KOA.
Just south of Amarillo is Palo Duro Canyon State Park with a road and campgrounds down in the second largest canyon in the US.
From there to Durango CO take in the train and Mesa Verde. From there to Salt Lake either through the Black Canyon of the Gunnison or Arches National Park Utah
Tyrone & Gladys
27' 1986 Coachmen