You won't have any problem. We travel at least twice a year, traveled from Indiana to the Florida panhandle, Southern Georgia, South Carolina (with diesel) and have never had a problem with fuel stations. And yes, we use auto gas stations, and not truck stops. My camper is 35.5 feet long, with my tow vehicle and cargo carrier on the bumper of the trailer, I'm 59.5 feet long from tip to tip. Never had a problem along major routes anywhere getting fuel. Now, inside town and cities can be challenging as their lots are sometimes smaller and more confined. Some I have passed completely because they do not have diesel. But out of the 1000 stations we've stopped at, maybe only 1 was passed up or I swung in and back out (mostly because the diesel pump did not exist or was so inconveniently located, it was impossible to get to it).
Go with confidence and just scope out the stations before pulling in. And there is nothing wrong with pulling up to the pump (gas) and then backing out from the pump and going around all the islands. Nothing says you have to "pull through" forward only.