Just for emphasis: Yellowstone is 2.4 times the size of Rhode Island, 1.5 times the size of Delaware, and 75% of the size of Connecticut.
And it has one two-lane road that loops through the middle of the park. And the speed limit on most of that road is 35 MPH. And the Park Rangers can and do give speeding tickets. And parts of that road are jammed with traffic during the summer.
The question then is: how much of Yellowstone do you really want to see? When you are satisfied with your answer to that question, you can decide how many times you want to move and where you want to camp.