It's going to be tricky to get from Lake Catherine State Park to Gulpha Gorge. Do not try to go thru downtown Hot Springs. Take the loop. You should check it out in your toad. Hwy 7 in Arkansas is not a good idea for an RV. Very hilly and windy. I would get back on I-30, then take I-430 to Hwy 10 to get to Maumelle. Pinnacle Valley Rd comes up quickly and depending on time of day there is traffic There is a traffic light. They are prepping to widen Pinnacle Valley Road and there may be delays. When we were there earlier this year they were cutting down trees. There is one more park we loved that you may look at before you go to Devils Den. Lake Fort Smith State Park. Completely redone. Remote, quiet large sites. Sites 15 or 17 would get satellite. Not sure if any local channels. No lakefront sites but gorgeous area. The road down to the park is steep but doable if you take it slow. We have been to most of these parks and agree that Arkansas has beautiful parks. DeGray Lake, and Petit Jean Mountain are 2 more great ones. Lots to see in Hot Springs and Fort Smith. Enjoy your trip!