Probably further than you want and more expensive, but you may want to consider Sallisaw/fort Smith West KOA. About 25 miles to downtown Fort Smith. Been about 13 years since I stayed there, but when I did it was a very nice park. Checking Google Satellite, the area still looks the same except I'm pretty sure the cows in the pasture are different.
2015 Ram 3500 4x4 Crew Cab SRW 6.4 Hemi LB 3.73 (12.4 hand calc avg mpg after 92,000 miles with camper)
2004 Lance 815 (prev: 2004 FW 35'; 1994 TT 30'; Tents)