If you do stop at a service plaza, you can park with the trucks, but be sure to stay as left as possible . What I do is walk from the truck area to the fuel area to see how to approach the fuel pumps. Usually when we stop at a service plaza, we make it a pit stop for bathrooms, coffee, snacks, lunch and then we fuel up (gas). I have traveled on I90 in NY and never had any issues. I haven't gone on I90 in MA. The gas prices are not much worse than if you get off the highway.
2016 Greyhawk 29MV
Wherever you go, there you are!