I'm one of the old guys on here -- started driving a truck on the farm when I had to use the hand throttle to give it gas because my feet didn't reach the foot pedals. I've been hauling campers for 40+ years. I always figured I could get into and out of any gas station.
Couple years ago we were in a remote area of eastern Oregon and running low on diesel. Couldn't find a station close by the highway and finally had to leave the highway and head into town. We spied a road sign that said "Shell diesel" so headed that way. Pulled into a little station in downtown Podunk. Filled up. No problems. Pulled out and headed down the street, looked in my side mirror and noticed a fender skirt hanging loose.
Damn! The camper had tilted so much pulling out that the tires scrubbed the fender skirt enough to break it. I stopped and walked around to the other side of the camper. Ouch! Seems I'd turned too quickly and got some paint off the fuel island's protective post as the tail swung around -- and left a little metal in return. Dinged both sides of the camper at one time and didn't even know it!
So this is really to say, good on the OP for being concerned. Some of these small stations aren't really designed for us towing campers. Best advice I can offer is to plan your fill up before you NEED to fill up, so if the station looks iffy, you can keep looking.