Tater chips are just soooo greasy, I try to avoid them! From a gas station; pretzel rods, chex mix, trail mix, bagged nuts, lots of stations now carrying meat and sausage snack packs. If I feel like something greasy, pop up a bag of microwave popcorn in the trailer, easy enough to eat up in the cab.
If I plan ahead a bit, it's much healthier snack fare: When I'm able to stop at a grocery; apples, naval oranges, seedless grapes, prewashed and cut celery sticks, baby carrots. PB + celery is a great snack food for the trailer, but too messy when I'm driving.
When I was driving the southwest, a lot of stations didn't have pretzels, they had pork rinds... kinda developed a taste for them, but they're very rare in my home area.