You will occasionally find that ants have invaded your RV. Usually, these are what we call “sweet ants” and they are usually there for the food. They typically follow each other in a single-file trail often close to a wall or the rear of the kitchen counter. Some RVers will attempt to use “ant spray” on their power cord, water hose, and sewer hose but there are so many “contact” points between an RV and the ground where ants could come in including tires, utility connections, jacks, cable TV connector, etc. Trying to spray all these “contact” points is nearly impossible. (For example, would you ever crawl underneath to spray the other side of your tires?)
There is an old remedy that has been around for 60 years or more. Buy a tiny bottle of “TERRO” ant killer (commonly available at a drug store, hardware, or grocery). You put ONE drop on a non-porous surface (some little plastic-covered tabs come with the bottle or just cut a small piece of aluminum foil about the size of a postage stamp), set the tab/foil (with the drop on it) in the path of the ants, and that’s it. We usually add a new drop the next day.
The ants will disappear in a couple of days.
It will not work on fire ants. It has ALWAYS worked on sweet ants.