I have read a few of these types of posts and I enjoy reading everybody's rationale for the way THEY prefer to do it. :B
Here is mine: We use our 5er for camping and enjoying the great out doors. That cost is what I would call one of our hobbies in life and the cost is what it is.
However, when we use our rig for "RVing", we are using our 5er as a alternative to staying in a motel. These types of situations arise, for example, when we are traveling for a wedding or the like. Not for "camping". This example is when I will compare the costs of the two.