I look for Pilot Stations, they are pretty large.
Most places are OK for my 30' motorhome, and even when I was driving a 40' DP, I had no problems with the car islands. In Arizona, the truck lanes have a extra fuel tax that is not applied to pickups or motorhomes, and it is worth it to move to the car pumps to buy 50+ gallons.
Most of the time when they see a larger RV in the area, cars pick the other side of the station to fill up, and give you room to get in and out.
At least you could stay overnight at a campground. Then go out to dinner, and pick up fuel on the way there or back to the campground.
Yes mom's like not cooking a few nights per week.
Fred.