Jed: Depending on what highway you take, there are lots of options. There are lots of cheap sites along the Natchez Trace, which I drove the last time I came up from Texas. This Trace is the old Indian trdae route, and it is a hiostoric highway. It goes right to Nashville. There ar hiking trails along it, so there are some places with restrooms. Also, get on the State of Tennessee website, and look at the state parks. Overnite fee is around $10.00 around here in Chattanooga, which includes showers.
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