Technically, it is bad ettiquite - The communications are supposed to concern the nature of the amateur radio hobby and emergency communications. I don't think its codified, since the last place I read that was in an etiquette guide that I can't find anymore. Besides, I hear all kinds of bad operating practice on the air -- RV'ers would be a welcome change.
Having said that, I'd gladly join you guys once my stuff gets unpacked and I get my antenna back up.

But, ETA is unknown; it could be a while as we are trying to sell the house.
-Jeff, AE5KZ -