Russ;
To your original request, the first thing we do when we PLAN a trip, and I think you do need a plan. I go online and google the tour company's such as (TAUK, Good Sam, AAA) and see where they stop to visit. I go to AAA get maps, and tour books for the destination and along the route. We use Microsoft trip and lay out the route in our GPS. We use the Rand McNally. During the day the GPS will tell us where we will be at a certain time of day and look for a campground in the GS book. Like you we try to get pull throughs, and 50 amp service. We call around noon and usually we get our requests.
The best place for advise I find is where you are now, the rvforum. As you see you will get all types of advise, some good some soso. advise is like the auto industry, many different makes, models, and colors, and like the advise all those different cars will still get you there.
See you on the road.
Jim