Flying J just got sold to Pilot (bummer, drag, etc). Loves got a few of them I think. Not nearly as sad as when T/A vacuumed up Rip Griffin locations, but . . . .
Use the AMBEST directory if you want to avoid chains (I like old truck stops, but then, I'm an old [relatively] truck driver).
Individually-owned and operated. Get a paper directory and keep notes about good ones (there are some VERY good ones), and note, too, the ones that are just zany (as in southern Louisiana at Frog City).
A big fuel tank is worth spending the money for, but keep fuel treated with PRI-G, LC-20 FUEL POWER or another high quality product.