Stayed at the KOA earlier this year and would recommend it. Is super nice, the showers are huge clean and hot, they have a BBQ smoker going all day and will deliver food to you via a golf cart and put it on your RV bill, two descent sized gated dog areas with toys, basically away from everything too so super quiet.
It is a ways from the Caverns but from what we saw of the other RV Parks after passing by them we made the right decision!
As mentioned above the Oil Industry is all over this area and when we left via the 285 it was a complete disaster. I can not believe that road did not damage my trailer. I've never driven on a road worse than that anywhere in the US. Also is single lane with 50,000 oil workers trying to get where they are going.