Just to toss in a few decades of camping and truck experience. At one point, we owned 2wd truck, HAHA, in Los Angeles. Went camping on easy roads as well ...
Then upgraded our attitude about camping, bought a 4x4 and began actually camping and getting into the beautiful back-country. We've been "nearly stuck" a few times, actually a lot of times, because of where we would camp, not due to camper or roads.
I believe the type of roads and the type of camping you choose, directly impacts the choice between 2wd and 4x4, and not necessarily the camper itself. But, you can always get more places with 4x4 than you can with 2wd, and you can often help yourself out of and into interesting situations with 4x4 where with the 2wd, you don't always have those choices. Personally, we'd rather have the choices then not. We've most often had a winch on the front as well, until this last truck which also makes a difference :)
We KNOW we'd have gotten stuck in many places without 4x4 because we've had to us Low-range and 4x4 to get unstuck, but then again, if we'd have only 2wd, it's unlikely we'd have gone there anyway. It was ALWAYS worth it to go tho'...