Not sure if you've left yet but, I've heard good things about the KOA in Smithfield. It's "around" exit 93 or so at Highway 96. Check KOA's website. It's also very close to halfway between state lines.
There is a KOA at MM63, closer to Fayetteville, that is very nice and the folks running it are super. Had a problem with my Transfer Switch shifting to Shore Power and the owner stayed with me till it was functional, naturally it was raining.
There is another place in West Memphis AR called Tom Sawyer rv park or something close to that. Very nice park mostly pull thrus on the banks of the
mississippi. They have park benches that you can sit on to watch the barge tows if you enjoy that, or from some sites you can see them out you window.
It is a nice park and nice folks.