I think the RV dealer was trying to make a joke that if you have an RV every vacation is a staycation because you take your home with you, and it fell flat
That's about the only explanation. Bcs yes, a "stay-cation" is when you stay at home and do vacation-like stuff instead of chores.
I have a couple of friends that are doing the homeschool while seeing the US in our RV thing. Basically the husband's job is going to require him to go to distance states and stay there for up to two months, but they are considered based out of Houston.
So my friend and their girls will follow him up to his assignment in the RV. They call it their staycation in X city on their blog.
When Iw as a kid, our social studies textbook about about a family that had to move from Vermont to California or somewhere. And they traveled there in an RV, without much money, and the dad would stop and get jobs in the different states/regions they traveled through. So you'd learn about the land, and the industries, and the people (accents, customs, etc.) of all the different regions of the U.S.
It was written in a narrative, like a story, and I loved it! I always thought that would be a great educational experience. (So did the mom in the book.)