As you are looking to stay out of the mountains, you may want to consider the I-75 route south. On the northern fringe of the Chattanooga area is Chester Frost County Park, one of my favorite places. Not exactly secluded, but this time of year is peaceful and definitely not crowded. They have some nice deep parking spots that accommodate 40' rigs and toad pretty well. You unhitch and then back in and then your patio side is directly on the water's edge of Harrison Bay/Tennessee river. Each site has 50/30/15A electric and good water, plus picnic table, grill, and fire ring. They don't have sewer hookups, but do have several dump stations around the park. Also there are full shower facilities and laundry rooms for anyone that needs/wants them.The island portion of the park (connected to the rest by a causeway) is closed to camping this time of year but is open to walk the trails that circle the island, including the wooded portion of it. Very quiet and pleasant.They don't do reservations, but this time of year that isn't a problem. To get the best of the best spots, arrive on a Monday afternoon, Tuesday, or Wednesday. http://www.hamiltontn.gov/parkrec/RulesFees.aspx (note: On that page it says "campground opens April 1st". That is referring to the island, the other part is open year round.)
Nice pictures Dave, we stayed at Chester Frost park earlier this year and really enjoyed it. Enjoy the quiet parks. Craig