Primitive campsites, such as those in national forests, are some of the prettiest available, but they generally have size restrictions and few or no hookups. As you list these, consider the amount of storage space each one might require. Sometimes this question is overlooked. In fact, some of us don't even know the price range we can afford, but we do know how large a monthly payment we can handle. When evaluating size requirements for your RV, consider privacy of the occupants as a major factor.
Time spent in the unit is another important item.
For very short periods of time, most of us can tolerate too little space. Short-term use, such as day trips or tailgate parties, doesn't call for a great amount of space, but it does mean a minimum amount of setup will be a real advantage. Extended travel has very nearly identical requirements as short-term use, but with economy of operation and driving ease added. As the time of use increases, the number of people who will use the unit on a regular basis starts to be a more important factor. Also, the style of camping you are interested in will have a bearing on size.