I use to ride motorcycles in my pre-army days, but sold it when I enlisted and then never got another one. Back then, it WAS a common thing to do an uplifted, left hand, forward facing fist as a "wave" between oncoming motorcyclists, or at intersections, or wherever 2 drivers met, even passing each other.
The nostalgia behind the "motorcycle wave" originated with the 1969 movie "Easy Rider". IT IS STRICTLY A MOTORCYCLE RIDER-TO-RIDER "THING!" It's amazing the concept has continued 45 years later.
But RV'ers do not share that same comradely between each other as motorcycle riders. I don't think there has been any kind of significant "event" that has caused such a feeling of "brotherhood" among RVers. For the most part, we are independent individuals (individual meaning all those associated with one rig, or one caravan). There's never been a significant event that we ALL can identify with that makes somehow "different" than the rest of the world, and that would unite us. For the most part, we are individuals and doing our own "thing."
But, once at the campground, and folks get REAL friendly. I know, it doesn't make sense, but there's something about the campground environment that draws people together then ... but NOT on the road!
Motorcyclists are a different breed with a different mind-set than camping families.
Let an event like "Easy Rider" happen to the RV audience that EVERYONE hooks into, and then maybe we'll have that special "connection" like motorcyclists do.
RV the Movie with Robin Williams, and The Long Long Trailer with Lucy Ball and Desie Arnaz just is not the "thing" that connects RVers into a special brotherhood. (only at the campground ... not on the road!) It's just a fact of RVing.