We have been up and down it several times. Only time we had a problem they were paving the road. I had to get out and move the cones over so we and those behind us could pass. There was no real shoulder on that portion. I understand from others here on the forums new RV parks suitable for Class As are now on the Trace.
In Tupelo, Mississippi, that of portion it is used ad part of their major road plan, which is illegal in my view and certainly counter to the intent. A lot more traffic on that portion and even banned semis and other commercial vehicles get away with using it at times..but they do catch some of them and the fines are very stiff..