We stayed at one truck stop, the Flyin J, just over the Ky border from Tn, one time only. The incessant such and such number your shower is ready and so on every three to five minutes all night long. This was 2006 or so.
We have entertained the though of stopping at Wall Mart etc from time to time when something went wrong with the Campground reservation or just terrible RV park but we haven't. We did spend one night at a Cracker Barrel, in west Tn, off I40, I think in our Fifth Wheel. So Wally World is a definate maybe down the road but not Cracker Barrel and not a truck stop.