East of Knoxville, TN on I40 is Kodak, TN (15 miles). Right now, I'm sitting in a room at the Holiday Inn Express looking out over two parking lots. One belongs to Bass Pro Shop and the other is a truck parking lot for this general hotel area. Both of these lots are less than 1/2 city block from the front door of the hotel. Across the access road is a large modern Shell station with RV parking / truck parking with diesel fuel ($3.669 / gal). If you are headed east the hotel and Bass Pro Shop are on the north side of the road. If you are familiar with this area at all it is the exit you would take off I40 should one be headed south to Pigeon Forge/Gatlinburg (south off this exit).
Should you decide on this place to stop, when you come off I40 make sure you are in the inside lane so that just as soon as you cross over the interstate you can make the left turn back into the complex. The Shell station, Cracker Barrel Restrurant will be across the access road to your right.