Lee,
We enjoyed our stay at
Cloud 9 RV park in Hot Springs. A small park, but great views, easy in\out, and well kept. The entrance is hard to find at first, but a great little park awaits!
We drove through the KOA at Hot Springs, but it felt very cramped and hard to maneuver. Sites are shorter than most and the terrain is tiered, so sites and turns often had a slope.
If you are coming in on I-30 West towards Dallas, there is a
KOA in Caddo Mills, TX just off the interstate, which is located about 40 miles outside of the Dallas city limit (Caddo Mills is a small town just before the towns that start to make up the DFW metroplex -- i.e., solid city.) I don't know of anything else that would be closer and still be a nice park. It gets good reviews on RVParkReviews.com, and we stayed there back in 2008 for our maiden voyage with our North Trail. It was a good park, just not as much scenery.
I-35 south from Dallas to Austin has lots of construction (I believe they are widening it), but most of the construction does not slow down the flow of traffic.
When you get in to the Dallas area, look us up!
Erika