the difference between camping, wheeling, and overlanding, is vehicle recovery.
wheeling, you tend to have a truck that skews waaaay to the offroading spectrum at the sacrifice of on road and payload. you may get stuck, but its a group exercise more akin to a dirtbike race that a trip.
camping, is merely not sleeping in house. that can be as simple as your own woods out back, or part of a larger journey.
overlanding assumes a long trip with adequate supplies, and a complete setup that will get you thru to the sights worth seeing. . . alone.
draw a straight line thru north america, and they system you put together has to function point A to point B. as a result, you end up with a lightly modified suspension, geared towards weight capacity, at the expense of flex, normal size tires (which could be 35's nowadays), and recovery gear that you can utilize alone.
once you have the confidence you can get your "offroad non-wheeler, non-rock crawler" over or thru an obstacle, you are free to explore places unknown to you.
therefore, even though most of a trip isnt in 4wd, you have adequate grip in the tires to keep moving when you need it, and when stuck, you have the tools and know how to get it out, in one piece, alone.
camping can be anything. wheeling means youre close to the security of home, or with a large organized group that can assist. overland has the elements of original self sufficient english exploration. so, i guess i think "overlanding" does sort of have a definition of its own, even if were defining it, by what it isnt.