There are many options on your route in my opinion, all around 900 miles give or take 30 miles. It really depends on what you have already seen and what you would like to see.
Hot Springs is a great place and there are some great places on the way. Some I would encourage you to check out, Kansas City (BBQ, Museums, Royals/Chiefs/Sporting, galleries);
Eureka Springs, AR is a great place to stay and spend a few days as well. Eureka Springs from KC is about 4 hours in motorhome, I enjoy staying at Wanderlust on Passion Play Road. Eureka has many shops, galleries, fantastic restaurants, crafts, outdoor activities (lakes, fishing, canoeing, scenic drives for toads/motorcycling).
KC to Hot Springs is about 7-8 hours, I recently took I-49 (71 Highway) south from KC to AR 270. Highway 71 from Springdale to AR 270 is a scenic drive, but I 540 runs parallel and is also scenic. AR 270 is also a scenic drive.
I would investigate and research how you would prefer to do the trip and head out. Good luck and safe travels.
2009 American Eagle 42'
Trailering HD Road Glide and Saab 9.3 or Cadillac Escalade ESV