The Holmes wrecker body company makes nearly all wrecker bodies, and it's home is in Chattanooga. It is a really neat museum, although my wife disagrees. You'd enjoy it, 56 FordGuy. There are a lot of things to do in Chattanooga. The Lookouts have a nice stadium. There is a riverboat cruise, an aquarium, Lookout mountain, Ruby Falls, Rock City, you can ride a "duck", an amphibious military vehicle, across the river. Though technically not on Tennessee, there is a great little amusement park just across the Georgia line called Lake Winniepasauka.
There are many nice State and National parks in Tennessee that are well worth exploring. Among my favorites are Fall Creek Falls, Reelfoot Lake, and Big South Fork. Just over in Kentucky, Stearns to be exact, is an old coal mining town where you can ride a train through. There is live music at the depot and everything. It is well worth the visit.