I’ve had a long talk with the wife about this and I’ve come to a conclusion...
We plan to take the trip to Yellowstone next year instead of this one. Pressure off.
In the meantime we will take a short trip for a short time. Afriend has an RV park about an hour and a half from my home, high atop Roan Mountain yet well within AAA range. We will give it a good shake down and determine (with the info gleaned here) what works, what does not work and how hot it gets. If everything is actually okay and I’m being a big weenie about it, then we might even go to Yellowstone this year. If, as I suspect, there is some heat issue that needs to be attended to, in whatever fashion my mechanic deems necessary, I have a year to get it done before we go on the big trip. I’m getting old, but I think I have at least another year in me. :P
Personally, I see a transmission cooler in my not-too-distant future. Even if it’s not 100% needed, it would make me feel better. Thanks everyone for their two cents. It has been quite a learning experience.