Yes, we have never had any difficulty in that regard.
This prompts me to say that we always use "regular" service stations and not the big truck stops. We tow a 34' fifth wheel and the secret is to "scope it out" before you pull in. I've had to back out a few times, but not many. We just got back from an RV trip to Santa Fe, NM and found diesel at every point we needed it.
We have had four fifth-wheels. Our first was a "well used" Prowler. On one of our first trips we stopped for fuel in a small Central Texas town. Everything seemed fine until that night in the state park where we were setting up camp I rounded the back of the trailer and saw the back cap pulled away from the side wall. I could tell a long, long story here but need only say that I will able to make pretty good repair and continued on our say to Colorado.
NOW -- I still cannot be totally sure, but I finally came to believe that I snagged one of those low posts at that gas station. I heard nothing, saw nothing, felt nothing, but that is the only reasonable explanation. From then on I have been very conscious of making wide turns and watching the trailer wheels come in very much from the truck wheels.
We have never had any difficulty finding fuel along that route I suggested. We just made the portion from Mount Pleasant to Amarillo last week, as we were going to Santa Fe and not to Colorado on that trip.
EDIT TO ADD. We made our first camping trip to Florida in 1962 during the Cuban missile crisis. We spent our first night in what was then Fort Picken State Park. We've been back many times -- staying in St. Andrews as well as Fort Pickens (when it was possible to get a campsite just by driving up and selected it -- that will be hard for many to believe. Oh, that first trip was with a tent not an RV but we've been back many times with an RV.