Gas stops along route to Yellowstone.

Wherever you can get into, and the price is not a rip-off. We used to look for WalMarts because of the discount when using their credit card. but they have discontinued that so better to use wherever and pay cash.

I try to use Flying Js for the Good Sam Discount but with that said... there are a number of decent APPs for locating fueling stops. Just check your App store and hunt around the truck, camping, and RV apps.

Crossing MO on 36, you will find accessible stations in Monroe, Chillicothe, Cameron; and St. Joseph will have plenty.
I think Chillicothe has a Walmart, but not sure if it has the gas station.

As far as what you can get into, you might see if you can find a copy of "The Next Exit." You might find one in a truck stop or, of course, an RV supply store. They highlight gas stations, RV parks, etc., that are (at least mostly) RV-friendly. We have found ours helpful. It does need to be as up to date as possible, though - a several-years-old used one might not be quite as good.

Most, if not all, towns have fuel, even the tiny ones. If people live there they have to buy it, also. :)

On long stretches and especially in the western states, get into the habit of driving on the top half of your tank so you're not in a panic for fuel. 'The Next Exit' is a good resource for interstate driving but it doesn't help on secondary roads. On those roads you can't wait it out and shop for prices. If you need it you're going to have to buy it.

You should try the Alaskan drive. :) It's all secondary roads and stations open and close at will sometimes.

Have a great trip!

Use the gas buddy app.

2gypsies has the best advice - "drive on the top half of your tank." Just realize that the west is very big and it can be a long way between gas pumps. Enjoy your trip!

I have made a list of Flying J's from their website and have a copy of the Next Exit on the way. But I was looking for first hand knowledge of stations at certain exits or towns with stations along the route that are easy in easy out with a 26ft TT. I have found that even with the Next Exit,some of the stations listed as RV friendly doesn't mean you can fit a large trailer at the gas pumps.So if anyone has first hand knowledge I would appreciate it.Thanks.

I think you are anticipating problems where none exist.

GO!

ENJOY!

We have found the book NEXT EXIT a valuable source of info when on the interstates. Each exit is shown with available services (food, hotels, gas, etc) with RV friendly sites indicated in red. Rest areas are also shown. Camp on!